a presentation of fetus

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The way a baby is positioned in the uterus just before birth can have a big effect on labor and delivery. This positioning is called fetal presentation.

Babies twist, stretch and tumble quite a bit during pregnancy. Before labor starts, however, they usually come to rest in a way that allows them to be delivered through the birth canal headfirst. This position is called cephalic presentation. But there are other ways a baby may settle just before labor begins.

Following are some of the possible ways a baby may be positioned at the end of pregnancy.

Head down, face down

When a baby is head down, face down, the medical term for it is the cephalic occiput anterior position. This the most common position for a baby to be born in. With the face down and turned slightly to the side, the smallest part of the baby's head leads the way through the birth canal. It is the easiest way for a baby to be born.

Head down, face up

When a baby is head down, face up, the medical term for it is the cephalic occiput posterior position. In this position, it might be harder for a baby's head to go under the pubic bone during delivery. That can make labor take longer.

Most babies who begin labor in this position eventually turn to be face down. If that doesn't happen, and the second stage of labor is taking a long time, a member of the health care team may reach through the vagina to help the baby turn. This is called manual rotation.

In some cases, a baby can be born in the head-down, face-up position. Use of forceps or a vacuum device to help with delivery is more common when a baby is in this position than in the head-down, face-down position. In some cases, a C-section delivery may be needed.

Frank breech

When a baby's feet or buttocks are in place to come out first during birth, it's called a breech presentation. This happens in about 3% to 4% of babies close to the time of birth. The baby shown below is in a frank breech presentation. That's when the knees aren't bent, and the feet are close to the baby's head. This is the most common type of breech presentation.

If you are more than 36 weeks into your pregnancy and your baby is in a frank breech presentation, your health care professional may try to move the baby into a head-down position. This is done using a procedure called external cephalic version. It involves one or two members of the health care team putting pressure on your belly with their hands to get the baby to roll into a head-down position.

If the procedure isn't successful, or if the baby moves back into a breech position, talk with a member of your health care team about the choices you have for delivery. Most babies in a frank breech position are born by planned C-section.

Complete and incomplete breech

A complete breech presentation, as shown below, is when the baby has both knees bent and both legs pulled close to the body. In an incomplete breech, one or both of the legs are not pulled close to the body, and one or both of the feet or knees are below the baby's buttocks. If a baby is in either of these positions, you might feel kicking in the lower part of your belly.

If you are more than 36 weeks into your pregnancy and your baby is in a complete or incomplete breech presentation, your health care professional may try to move the baby into a head-down position. This is done using a procedure called external cephalic version. It involves one or two members of the health care team putting pressure on your belly with their hands to get the baby to roll into a head-down position.

If the procedure isn't successful, or if the baby moves back into a breech position, talk with a member of your health care team about the choices you have for delivery. Many babies in a complete or incomplete breech position are born by planned C-section.

When a baby is sideways — lying horizontal across the uterus, rather than vertical — it's called a transverse lie. In this position, the baby's back might be:

• Down, with the back facing the birth canal.
• Sideways, with one shoulder pointing toward the birth canal.
• Up, with the hands and feet facing the birth canal.

Although many babies are sideways early in pregnancy, few stay this way when labor begins.

If your baby is in a transverse lie during week 37 of your pregnancy, your health care professional may try to move the baby into a head-down position. This is done using a procedure called external cephalic version. External cephalic version involves one or two members of your health care team putting pressure on your belly with their hands to get the baby to roll into a head-down position.

If the procedure isn't successful, or if the baby moves back into a transverse lie, talk with a member of your health care team about the choices you have for delivery. Many babies who are in a transverse lie are born by C-section.

If you're pregnant with twins and only the twin that's lower in the uterus is head down, as shown below, your health care provider may first deliver that baby vaginally.

Then, in some cases, your health care team may suggest delivering the second twin in the breech position. Or they may try to move the second twin into a head-down position. This is done using a procedure called external cephalic version. External cephalic version involves one or two members of the health care team putting pressure on your belly with their hands to get the baby to roll into a head-down position.

Your health care team may suggest delivery by C-section for the second twin if:

• An attempt to deliver the baby in the breech position is not successful.
• You do not want to try to have the baby delivered vaginally in the breech position.
• An attempt to move the baby into a head-down position is not successful.
• You do not want to try to move the baby to a head-down position.

In some cases, your health care team may advise that you have both twins delivered by C-section. That might happen if the lower twin is not head down, the second twin has low or high birth weight as compared to the first twin, or if preterm labor starts.

• Landon MB, et al., eds. Normal labor and delivery. In: Gabbe's Obstetrics: Normal and Problem Pregnancies. 8th ed. Elsevier; 2021. https://www.clinicalkey.com. Accessed May 19, 2023.
• Holcroft Argani C, et al. Occiput posterior position. https://www.updtodate.com/contents/search. Accessed May 19, 2023.
• Frequently asked questions: If your baby is breech. American College of Obstetricians and Gynecologists https://www.acog.org/womens-health/faqs/if-your-baby-is-breech. Accessed May 22, 2023.
• Hofmeyr GJ. Overview of breech presentation. https://www.updtodate.com/contents/search. Accessed May 22, 2023.
• Strauss RA, et al. Transverse fetal lie. https://www.updtodate.com/contents/search. Accessed May 22, 2023.
• Chasen ST, et al. Twin pregnancy: Labor and delivery. https://www.updtodate.com/contents/search. Accessed May 22, 2023.
• Cohen R, et al. Is vaginal delivery of a breech second twin safe? A comparison between delivery of vertex and non-vertex second twins. The Journal of Maternal-Fetal & Neonatal Medicine. 2021; doi:10.1080/14767058.2021.2005569.
• Marnach ML (expert opinion). Mayo Clinic. May 31, 2023.

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Fetal Presentation, Position, and Lie (Including Breech Presentation)

• Variations in Fetal Position and Presentation |

During pregnancy, the fetus can be positioned in many different ways inside the mother's uterus. The fetus may be head up or down or facing the mother's back or front. At first, the fetus can move around easily or shift position as the mother moves. Toward the end of the pregnancy the fetus is larger, has less room to move, and stays in one position. How the fetus is positioned has an important effect on delivery and, for certain positions, a cesarean delivery is necessary. There are medical terms that describe precisely how the fetus is positioned, and identifying the fetal position helps doctors to anticipate potential difficulties during labor and delivery.

Presentation refers to the part of the fetus’s body that leads the way out through the birth canal (called the presenting part). Usually, the head leads the way, but sometimes the buttocks (breech presentation), shoulder, or face leads the way.

Position refers to whether the fetus is facing backward (occiput anterior) or forward (occiput posterior). The occiput is a bone at the back of the baby's head. Therefore, facing backward is called occiput anterior (facing the mother’s back and facing down when the mother lies on her back). Facing forward is called occiput posterior (facing toward the mother's pubic bone and facing up when the mother lies on her back).

Lie refers to the angle of the fetus in relation to the mother and the uterus. Up-and-down (with the baby's spine parallel to mother's spine, called longitudinal) is normal, but sometimes the lie is sideways (transverse) or at an angle (oblique).

For these aspects of fetal positioning, the combination that is the most common, safest, and easiest for the mother to deliver is the following:

Head first (called vertex or cephalic presentation)

Facing backward (occiput anterior position)

Spine parallel to mother's spine (longitudinal lie)

Neck bent forward with chin tucked

Arms folded across the chest

If the fetus is in a different position, lie, or presentation, labor may be more difficult, and a normal vaginal delivery may not be possible.

Variations in fetal presentation, position, or lie may occur when

The fetus is too large for the mother's pelvis (fetopelvic disproportion).

The uterus is abnormally shaped or contains growths such as fibroids .

The fetus has a birth defect .

There is more than one fetus (multiple gestation).

Position and Presentation of the Fetus

Variations in Fetal Position and Presentation

Some variations in position and presentation that make delivery difficult occur frequently.

Occiput posterior position

In occiput posterior position (sometimes called sunny-side up), the fetus is head first (vertex presentation) but is facing forward (toward the mother's pubic bone—that is, facing up when the mother lies on her back). This is a very common position that is not abnormal, but it makes delivery more difficult than when the fetus is in the occiput anterior position (facing toward the mother's spine—that is facing down when the mother lies on her back).

When a fetus faces up, the neck is often straightened rather than bent,which requires more room for the head to pass through the birth canal. Delivery assisted by a vacuum device or forceps or cesarean delivery may be necessary.

Breech presentation

In breech presentation, the baby's buttocks or sometimes the feet are positioned to deliver first (before the head).

When delivered vaginally, babies that present buttocks first are more at risk of injury or even death than those that present head first.

The reason for the risks to babies in breech presentation is that the baby's hips and buttocks are not as wide as the head. Therefore, when the hips and buttocks pass through the cervix first, the passageway may not be wide enough for the head to pass through. In addition, when the head follows the buttocks, the neck may be bent slightly backwards. The neck being bent backward increases the width required for delivery as compared to when the head is angled forward with the chin tucked, which is the position that is easiest for delivery. Thus, the baby’s body may be delivered and then the head may get caught and not be able to pass through the birth canal. When the baby’s head is caught, this puts pressure on the umbilical cord in the birth canal, so that very little oxygen can reach the baby. Brain damage due to lack of oxygen is more common among breech babies than among those presenting head first.

In a first delivery, these problems may occur more frequently because a woman’s tissues have not been stretched by previous deliveries. Because of risk of injury or even death to the baby, cesarean delivery is preferred when the fetus is in breech presentation, unless the doctor is very experienced with and skilled at delivering breech babies or there is not an adequate facility or equipment to safely perform a cesarean delivery.

Breech presentation is more likely to occur in the following circumstances:

Labor starts too soon (preterm labor).

The uterus is abnormally shaped or contains abnormal growths such as fibroids .

Other presentations

In face presentation, the baby's neck arches back so that the face presents first rather than the top of the head.

In brow presentation, the neck is moderately arched so that the brow presents first.

Usually, fetuses do not stay in a face or brow presentation. These presentations often change to a vertex (top of the head) presentation before or during labor. If they do not, a cesarean delivery is usually recommended.

In transverse lie, the fetus lies horizontally across the birth canal and presents shoulder first. A cesarean delivery is done, unless the fetus is the second in a set of twins. In such a case, the fetus may be turned to be delivered through the vagina.

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What to know about baby’s position at birth

Having a baby is an exciting time, but it’s common to have some worries about labor and delivery. One thing that often causes mums-to-be concern is what position their baby will be in when the time comes for them to be born.

For a vaginal delivery, the baby must descend through the birth canal, passing through your pelvis to reach the vaginal opening. The position of the baby - or presentation of the fetus as it is also known - affects how quickly and easily the baby can be born. Some positions allow the baby to tuck their chin, and re-position and rotate their head to make their journey easier.

Here’s a guide to help you understand the language used to describe the position of babies and some tips for helping them into the ideal position for birth.

Position of the baby before birth

During pregnancy your baby has room to move about in your uterus or womb - twisting, turning, rolling, stretching and getting in some kicks. As your pregnancy progresses and they grow bigger there’s less room for them to move, but your baby should still move regularly until they are born, even during labor.

Sometime between 32 and 38 weeks of pregnancy, but usually around week 36, babies tend to move into a head down position. This allows their head to come out of your vagina first when they are born. Only about 3 to 4 percent of babies do not move into a head-first or cephalic presentation before birth.

What’s the ideal position of a baby for birth?

Occiput anterior is the ideal presentation for your baby to be in for a vaginal delivery.

Occiput anterior is a type of head-first or cephalic presentation for delivery of a baby. About 95 to 97 percent of babies position themselves in a cephalic presentation for delivery, often with the crown or top of their head - which is also known as the vertex - entering the birth canal first.

Usually when a baby is being born in a vertex presentation the back of the baby’s head, which is called the occiput, is towards the front or anterior of your pelvis and their back is towards your belly. Their chin is also typically in a flexed position, tucked into their chest.

Occiput anterior is the best and safest position for a baby to be born by a vaginal birth. It allows the smallest diameter of a baby’s head to descend into the birth canal first, making it easier for the baby to fit through your pelvis.

What other positions are babies born in?

Sometimes babies don’t position themselves in the ideal position for birth. These other positions are called abnormal positions. Listed below are the abnormal positions or presentations that some babies are born in.

Occiput posterior or back-to-back presentation

Occiput posterior position or back-to-back presentation occurs when the occiput - back of a baby’s head - is positioned towards your tailbone or back during delivery. Sometimes this presentation is also called “sunny side up” because babies born in this position enter the world facing up. About 5 percent of babies are delivered in the occiput posterior position.

Babies presenting in the occiput posterior position find it harder to make their way through the birth canal, which can lead to a longer labor. This presentation is three times more likely to end in a cesarean section (c-section) compared with babies presenting in the ideal, occiput anterior presentation.

Breech presentation

A breech presentation occurs when your baby’s buttock, feet or both are set to come out first at birth. About 3 to 4 percent of full-term babies are born in a breech position.

There are three types of breech presentation including:

• Frank breech. Frank breech is the most common breech presentation, occurring in 50 to 70 percent of breech births. Babies in the Frank breech position have their hips flexed and their knees extended so that their legs are folded flat against their head. Their bottom is closest to the birth canal.
• Footling or incomplete breech. Footling or incomplete breeches occur in 10 to 30 percent of breech births. An incomplete breech presentation is where just one of the baby’s knees is bent up. Their other foot and bottom are closest to the birth canal. In a footling breech presentation, one or both feet may be delivered first.
• Complete breech. A complete breech presentation is less common, occurring in 5 to 10 percent of breech births. Babies in a complete breech position have both knees bent and their feet and bottom are closest to the birth canal.

A breech delivery can result in the baby’s head or shoulders becoming stuck because opening to the uterus (cervix) may not be stretched enough by the baby’s body to allow the head and shoulders to pass through. Umbilical cord prolapse can also occur. This is when the cord slips into the vagina before the baby is delivered. If the cord is pinched then the flow of blood and oxygen to the baby can be reduced.

If an exam reveals your baby is sitting in a breech position and you’re past 36 weeks of pregnancy then external cephalic version (ECV) might be attempted to improve your chances of having a vaginal birth. ECV is performed by a qualified healthcare professional and it involves them pressing their hands on the outside of your belly to try and turn the baby.

Most babies found to be in a breech position are delivered by c-section because studies indicate that a vaginal delivery is about three times more likely to cause serious harm to the baby.

Brow and face presentations

Babies can also arrive brow- or face-first. A brow presentation results in the widest part of your baby’s head trying to fit through your pelvis first. This is a rare presentation, affecting about 1 in every 500 to 1400 births.

Instead of flexing and tucking their chin, babies presenting brow-first slightly extend their head and neck in the same way they would if they were looking up.

If your baby stays in a brow presentation it’s highly unlikely that they will be able to make their way through your pelvis. If your cervix is fully dilated then your doctor may be able to use their hand or ventouse - a vacuum cup - to move your baby’s head into a flexed position. If there are signs that your baby is becoming distressed or labor isn’t progressing then a c-section may be recommended.

More than half of the babies presenting brow-first, however, flex their head during early labor and move into a better position that allows labor to progress. Although, some babies tip their head back further and present face-first.

A face presentation is another rare position for a baby to be born in, occurring in only 1 in every 600 to 800 births.

Almost three quarters of babies presenting face-first can be delivered vaginally, especially if the baby’s chin is near your pubic bone, although labor may be prolonged.

Some baby’s presenting face-first may need to be delivered by c-section, particularly if their chin is near your tailbone, your labor is not progressing or your baby’s heart rate is causing concern.

Shoulder presentation

If your baby is lying sideways across your uterus - in a transverse lie - their shoulder can present first. Shoulder presentation occurs in less than 1 percent of deliveries. Virtually all babies in a shoulder presentation will need to be delivered by c-section. If labor begins while the baby is in this position then the shoulder will become stuck in the pelvis and the labor will not progress.

What factors can influence the position of my baby?

A number of factors can influence the position of your baby during labor and delivery, including:

• If you have been pregnant before
• The size and shape of your pelvis
• Having an abnormally shaped uterus
• Having growths in your uterus, such as fibroids
• Having placenta previa - the placenta covers some or all of the cervix
• A premature birth
• Having twins or multiple babies
• Having too much (polyhydramnios) or too little (oligohydramnios) amniotic fluid
• Abnormalities that prevent the baby tucking their chin to their chest

How do I tell what position my baby is in?

Your midwife or your obstetrician-gynecologist (OB-GYN) should be able to tell you the position of your baby by feeling your belly, using an ultrasound scan or conducting a pelvic exam.

You might also be able to tell the position of the baby from their movements.

If your baby is in a back-to-back position your belly may feel more squishy and their kicks are likely to be felt or seen around the middle of your belly. You may also notice that instead of your belly poking out there is a dip around your belly button.

If your baby is in the ideal occiput anterior presentation you’re likely to feel the firm, rounded surface of your baby’s back on one side of your belly and feel kicks up under your ribs.

How do I get my baby into the best position for birth?

Here are some tips to try to encourage your baby to engage in the ideal position for birth:

• Remain upright, but lean forward to create more space in your pelvis for your baby to turn.
• Sit with your back as straight as possible and your knees lower than your hips. Placing a cushion under your bottom and one behind your back may make this position more comfortable. Avoid sitting with your knees higher than your pelvis.
• When you read a book, sit on a dining room chair and rest your elbows on the table. Lean forward slightly with your knees apart. Avoid crossing your knees.
• If pelvic girdle pain is not an issue, try sitting facing backwards with your arms resting on the back of a chair.
• Watch TV kneeling on the floor leaning over a big bean bag.
• Go for a swim.
• Sit on a birth ball or swiss ball - they can be used both before and during labor.
• Lie down on your side rather than your back. Place a pillow between your knees for comfort.
• Try moving about on all fours. Try wiggling your hips or arching your back before straightening your spine again.
• During Braxton Hicks (practice contractions), use a forward leaning posture
• During contractions, stay on your feet, lean forwards and rock your hips from side to side and up and down to get your bottom wiggling as you walk

Remember to attend your antenatal appointments and contact your midwife or OB-GYN if you have any questions or concerns about the position of your baby.

Article references

• MedlinePlus . Your baby in the birth canal. Available at: https://medlineplus.gov/ency/article/002060.htm . [Accessed May 19, 2022].
• NHS Inform. How your baby lies in the womb. August 17, 2021. Available at: https://www.nhsinform.scot/ready-steady-baby/labour-and-birth/getting-ready-for-the-birth/how-your-baby-lies-in-the-womb . [Accessed May 19, 2022].
• The American College of Obstetricians and Gynecologists (ACOG). If Your Baby is Breech. November 2020. Available at: https://www.acog.org/womens-health/faqs/if-your-baby-is-breech . [Accessed May 19, 2022].
• MedlinePlus. Breech - series - Types of breech presentation. March 12, 2020. Available at: https://medlineplus.gov/ency/presentations/100193_3.htm . [Accessed May 19, 2022].
• Medscape . Breech Presentation. January 20, 2022. Available at: https://emedicine.medscape.com/article/262159-overview . [Accessed May 19, 2022].
• Physicians & Midwives. Which Way is Up? What Your Baby’s Position Means for Your Delivery. November 15, 2012. Available at: https://physiciansandmidwives.com/what-your-babys-position-means-for-delivery/ . [Accessed May 19, 2022].
• BabyCentre. What is brow presentation? Available at: https://www.babycentre.co.uk/x564026/what-is-brow-presentation . [Accessed May 19, 2022].
• NCT. Bay position in the womb before birth. Available at: https://www.nct.org.uk/labour-birth/getting-ready-for-birth/baby-positions-womb-birth . [Accessed May 19, 2022].
• NHS Forth Valley. Ante Natal Advice for Optimal Fetal Positioning. 2020. Available at: https://nhsforthvalley.com/wp-content/uploads/2014/01/Ante-Natal-Advice-for-Optimal-Fetal-Positioning.pdf . [Accessed May 19, 2022].

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If Your Baby Is Breech

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Frequently Asked Questions Expand All

In the last weeks of pregnancy, a fetus usually moves so his or her head is positioned to come out of the vagina first during birth. This is called a vertex presentation . A breech presentation occurs when the fetus’s buttocks, feet, or both are in place to come out first during birth. This happens in 3–4% of full-term births.

It is not always known why a fetus is breech. Some factors that may contribute to a fetus being in a breech presentation include the following:

You have been pregnant before.

There is more than one fetus in the uterus (twins or more).

There is too much or too little amniotic fluid .

The uterus is not normal in shape or has abnormal growths such as fibroids .

The placenta covers all or part of the opening of the uterus ( placenta previa )

The fetus is preterm .

Occasionally fetuses with certain birth defects will not turn into the head-down position before birth. However, most fetuses in a breech presentation are otherwise normal.

Your health care professional may be able to tell which way your fetus is facing by placing his or her hands at certain points on your abdomen. By feeling where the fetus's head, back, and buttocks are, it may be possible to find out what part of the fetus is presenting first. An ultrasound exam or pelvic exam may be used to confirm it.

External cephalic version (ECV) is an attempt to turn the fetus so that he or she is head down. ECV can improve your chance of having a vaginal birth. If the fetus is breech and your pregnancy is greater than 36 weeks your health care professional may suggest ECV.

ECV will not be tried if:

You are carrying more than one fetus

There are concerns about the health of the fetus

You have certain abnormalities of the reproductive system

The placenta is in the wrong place

The placenta has come away from the wall of the uterus ( placental abruption )

ECV can be considered if you have had a previous cesarean delivery .

The health care professional performs ECV by placing his or her hands on your abdomen. Firm pressure is applied to the abdomen so that the fetus rolls into a head-down position. Two people may be needed to perform ECV. Ultrasound also may be used to help guide the turning.

The fetus's heart rate is checked with fetal monitoring before and after ECV. If any problems arise with you or the fetus, ECV will be stopped right away. ECV usually is done near a delivery room. If a problem occurs, a cesarean delivery can be performed quickly, if necessary.

Complications may include the following:

Prelabor rupture of membranes

Changes in the fetus's heart rate

Placental abruption

Preterm labor

More than one half of attempts at ECV succeed. However, some fetuses who are successfully turned with ECV move back into a breech presentation. If this happens, ECV may be tried again. ECV tends to be harder to do as the time for birth gets closer. As the fetus grows bigger, there is less room for him or her to move.

Most fetuses that are breech are born by planned cesarean delivery. A planned vaginal birth of a single breech fetus may be considered in some situations. Both vaginal birth and cesarean birth carry certain risks when a fetus is breech. However, the risk of complications is higher with a planned vaginal delivery than with a planned cesarean delivery.

In a breech presentation, the body comes out first, leaving the baby’s head to be delivered last. The baby’s body may not stretch the cervix enough to allow room for the baby’s head to come out easily. There is a risk that the baby’s head or shoulders may become wedged against the bones of the mother’s pelvis. Another problem that can happen during a vaginal breech birth is a prolapsed umbilical cord . It can slip into the vagina before the baby is delivered. If there is pressure put on the cord or it becomes pinched, it can decrease the flow of blood and oxygen through the cord to the baby.

Although a planned cesarean birth is the most common way that breech fetuses are born, there may be reasons to try to avoid a cesarean birth.

A cesarean delivery is major surgery. Complications may include infection, bleeding, or injury to internal organs.

The type of anesthesia used sometimes causes problems.

Having a cesarean delivery also can lead to serious problems in future pregnancies, such as rupture of the uterus and complications with the placenta.

With each cesarean delivery, these risks increase.

If you are thinking about having a vaginal birth and your fetus is breech, your health care professional will review the risks and benefits of vaginal birth and cesarean birth in detail. You usually need to meet certain guidelines specific to your hospital. The experience of your health care professional in delivering breech babies vaginally also is an important factor.

Amniotic Fluid : Fluid in the sac that holds the fetus.

Anesthesia : Relief of pain by loss of sensation.

Breech Presentation : A position in which the feet or buttocks of the fetus would appear first during birth.

Cervix : The lower, narrow end of the uterus at the top of the vagina.

Cesarean Delivery : Delivery of a fetus from the uterus through an incision made in the woman’s abdomen.

External Cephalic Version (ECV) : A technique, performed late in pregnancy, in which the doctor attempts to manually move a breech baby into the head-down position.

Fetus : The stage of human development beyond 8 completed weeks after fertilization.

Fibroids : Growths that form in the muscle of the uterus. Fibroids usually are noncancerous.

Oxygen : An element that we breathe in to sustain life.

Pelvic Exam : A physical examination of a woman’s pelvic organs.

Placenta : Tissue that provides nourishment to and takes waste away from the fetus.

Placenta Previa : A condition in which the placenta covers the opening of the uterus.

Placental Abruption : A condition in which the placenta has begun to separate from the uterus before the fetus is born.

Prelabor Rupture of Membranes : Rupture of the amniotic membranes that happens before labor begins. Also called premature rupture of membranes (PROM).

Preterm : Less than 37 weeks of pregnancy.

Ultrasound Exam : A test in which sound waves are used to examine inner parts of the body. During pregnancy, ultrasound can be used to check the fetus.

Umbilical Cord : A cord-like structure containing blood vessels. It connects the fetus to the placenta.

Uterus : A muscular organ in the female pelvis. During pregnancy, this organ holds and nourishes the fetus.

Vagina : A tube-like structure surrounded by muscles. The vagina leads from the uterus to the outside of the body.

Vertex Presentation : A presentation of the fetus where the head is positioned down.

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Published: January 2019

Last reviewed: August 2022

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pregnancy health center / pregnancy a-z list / what are the different fetal positions article

What Are the Different Fetal Positions?

• Medical Author: Karthik Kumar, MBBS
• Medical Reviewer: Pallavi Suyog Uttekar, MD

5 Types of Fetal Positions and Presentations

• Comments **COMMENTSTAGLIST**
• More **OTHERTAGLIST**

The relationship between your baby's backbone and your backbone when your baby is in-utero is called the fetal position. Your baby can be in a variety of fetal positions, some make birth easier than others.

• Longitudinal position: The fetus’ and mother’s backbones are parallel to each other in this position.
• Transverse position: In this posture, the fetus’ backbone is at a right angle to the mother's backbone.
• Oblique position: The inclination angle of the fetus backbone is more than 0 and less than 90 degrees of the mother's backbone in this position.

Most people, however, confuse fetal position with the fetal presentation.

• Fetal position refers to whether the fetus is facing backward (facing the woman's back when she lies down) or forward (facing the woman's abdomen when she lies down).
• Fetal presentation is the body part of the baby that leads the way out of the birth canal.

The fetal position and presentation of your baby may influence the difficulty of your delivery. The baby may drop down into the pelvis before the due date. Here are some of the different positions and presentations your baby can get into while you are preparing for childbirth .

During pregnancy and when preparing for childbirth , there are exercises moms can do when the baby is active to get it in the optimal fetal position, which is known as baby spinning. Starting at the 35th week of pregnancy, talk to your doctor about maternal positioning.

Occiput anterior (OA) or vertex presentation

This is the optimal fetal positioning for childbirth . The baby enters the pelvis with their head down and chin tucked to the chest, facing the mother's back. The head points to the birth canal in this position.

There are two more presentations in OA:

• The baby will remain in the OA position, but the face, rather than the head, will be pointing toward the birth canal.
• This occurs when the chin is not tucked against the chest and instead points outward.
• During a vaginal examination, the doctor can detect this position by feeling the baby's bony jaws and mouth.
• In brow presentation, the baby will be in the OA position with their forehead pointing toward the birth canal. The doctor can feel the anterior fontanelle and the orbits of the forehead during the vaginal examination.
• One arm lies along with the head, pointing toward the birth canal.
• The arms may slide back during the delivery process, but if they do not, extra care must be taken to safely remove the baby.

Occiput posterior (OP)

• The baby enters the pelvis with its head down but facing the mother's front or abdomen.
• In general, approximately 10 to 34 percent of babies remain in the OP position during the first stage of labor before shifting to the optimal (OA) position.
• However, some babies remain in this position, which can make labor difficult and necessitate an emergency Cesarean delivery.
• This fetal position can cause labor to be prolonged, resulting in instrumental interventions, severe perineal tears, or Cesarean delivery.

The cephalic presentation or head-first positions are referred to as OA and OP.

Occiput transverse (OT)

• In the womb, the baby is lying sideways, and if they do not turn to the optimal position in time for birth, a Cesarean delivery is required.
• During a vaginal examination, the doctor may feel the shoulder, arm, elbow, or hand protruding into the vagina.
• This baby position increases the risk of umbilical cord prolapse, which occurs when the umbilical cord protrudes before the baby.
• Cord prolapse can occur in about one percent of babies in the transverse position, which is a medical emergency that necessitates an immediate Cesarean delivery.
• In some cases, assisted delivery is performed by manually rotating the baby or using forceps or a vacuum to position the baby in the ideal position.

Umbilical cord presentation

• During this time, the umbilical cord is the first to emerge from the birth canal.
• The condition of the uterine membrane, however, distinguishes umbilical cord presentation from prolapse.
• A cord presentation occurs when the umbilical cord enters the birth canal before the water breaks, whereas a cord prolapse occurs after the water breaks, necessitating an emergency Cesarean delivery.

Breech position

The infant is positioned with its buttocks directed toward the birth canal, resulting in the following types of breech positions:

• The buttocks are pointing toward the birth canal, with the legs folded at the knees and the feet close to the buttocks.
• In a vaginal delivery, this position increases the risk of an umbilical cord loop. Furthermore, the cord may pass through the cervix before the head, injuring the baby.
• The buttocks are pointing toward the birth canal with the legs straight up and the feet reaching the head.
• This can result in an umbilical cord loop, which can injure the baby during vaginal birth.
• The baby's buttocks are pointing down, and one of their feet is pointing toward the birthing canal.
• This can result in an umbilical cord prolapse, which can cut off the fetus' blood supply and oxygen supply.

A clinical examination of the abdomen, a vaginal examination, or an ultrasound examination is used to determine the position and presentation of the fetus during pregnancy.

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Obstetric and Newborn Care I

10.02 key terms related to fetal positions.

a. “Lie” of an Infant.

Lie refers to the position of the spinal column of the fetus in relation to the spinal column of the mother. There are two types of lie, longitudinal and transverse. Longitudinal indicates that the baby is lying lengthwise in the uterus, with its head or buttocks down. Transverse indicates that the baby is lying crosswise in the uterus.

b. Presentation/Presenting Part.

Presentation refers to that part of the fetus that is coming through (or attempting to come through) the pelvis first.

(1) Types of presentations (see figure 10-1). The vertex or cephalic (head), breech, and shoulder are the three types of presentations. In vertex or cephalic, the head comes down first. In breech, the feet or buttocks comes down first, and last–in shoulder, the arm or shoulder comes down first. This is usually referred to as a transverse lie.

(2) Percentages of presentations.

(a) Head first is the most common-96 percent.

(b) Breech is the next most common-3.5 percent.

(c) Shoulder or arm is the least common-5 percent.

(3) Specific presentation may be evaluated by several ways.

(a) Abdominal palpation-this is not always accurate.

(b) Vaginal exam–this may give a good indication but not infallible.

(c) Ultrasound–this confirms assumptions made by previous methods.

(d) X-ray–this confirms the presentation, but is used only as a last resort due to possible harm to the fetus as a result of exposure to radiation.

c. Attitude.

This is the degree of flexion of the fetus body parts (body, head, and extremities) to each other. Flexion is resistance to the descent of the fetus down the birth canal, which causes the head to flex or bend so that the chin approaches the chest.

(1) Types of attitude (see figure 10-2).

(a) Complete flexion. This is normal attitude in cephalic presentation. With cephalic, there is complete flexion at the head when the fetus “chin is on his chest.” This allows the smallest cephalic diameter to enter the pelvis, which gives the fewest mechanical problems with descent and delivery.

(b) Moderate flexion or military attitude. In cephalic presentation, the fetus head is only partially flexed or not flexed. It gives the appearance of a military person at attention. A larger diameter of the head would be coming through the passageway.

(c) Poor flexion or marked extension. In reference to the fetus head, it is extended or bent backwards. This would be called a brow presentation. It is difficult to deliver because the widest diameter of the head enters the pelvis first. This type of cephalic presentation may require a C/Section if the attitude cannot be changed.

(d) Hyperextended. In reference to the cephalic position, the fetus head is extended all the way back. This allows a face or chin to present first in the pelvis. If there is adequate room in the pelvis, the fetus may be delivered vaginally.

(2) Areas to look at for flexion.

(a) Head-discussed in previous paragraph, 10-2c(1).

(b) Thighs-flexed on the abdomen.

(c) Knees-flexed at the knee joints.

(d) Arches of the feet-rested on the anterior surface of the legs.

(e) Arms-crossed over the thorax.

(3) Attitude of general flexion. This is when all of the above areas are flexed appropriately as described.

d. Station.

This refers to the depth that the presenting part has descended into the pelvis in relation to the ischial spines of the mother’s pelvis. Measurement of the station is as follows:

(1) The degree of advancement of the presenting part through the pelvis is measured in centimeters.

(2) The ischial spines is the dividing line between plus and minus stations.

(3) Above the ischial spines is referred to as -1 to -5, the numbers going higher as the presenting part gets higher in the pelvis (see figure10-3).

(4) The ischial spines is zero (0) station.

(5) Below the ischial spines is referred to +1 to +5, indicating the lower the presenting part advances.

e. Engagement.

This refers to the entrance of the presenting part of the fetus into the true pelvis or the largest diameter of the presenting part into the true pelvis. In relation to the head, the fetus is said to be engaged when it reaches the midpelvis or at a zero (0) station. Once the fetus is engaged, it (fetus) does not go back up. Prior to engagement occurring, the fetus is said to be “floating” or ballottable.

f. Position.

This is the relationship between a predetermined point of reference or direction on the presenting part of the fetus to the pelvis of the mother.

(1) The maternal pelvis is divided into quadrants.

(a) Right and left side, viewed as the mother would.

(b) Anterior and posterior. This is a line cutting the pelvis in the middle from side to side. The top half is anterior and the bottom half is posterior.

(c) The quadrants never change, but sometimes it is confusing because the student or physician’s viewpoint changes.

NOTE: Remember that when you are describing the quadrants, view them as the mother would.

(2) Specific points on the fetus.

(a) Cephalic or head presentation.

1 Occiput (O). This refers to the Y sutures on the top of the head.

2 Brow or fronto (F). This refers to the diamond sutures or anterior fontanel on the head.

3 Face or chin presentation (M). This refers to the mentum or chin.

(b) Breech or butt presentation.

1 Sacrum or coccyx (S). This is the point of reference.

2 Breech birth is associated with a higher perinatal mortality.

(c) Shoulder presentation.

1 This would be seen with a transverse lie.

2. Scapula (Sc) or its upper tip, the acromion (A) would be used for the point of reference.

(3) Coding of positions.

(a) Coding simplifies explaining the various positions.

1 The first letter of the code tells which side of the pelvis the fetus reference point is on (R for right, L for left).

2 The second letter tells what reference point on the fetus is being used (Occiput-O, Fronto-F, Mentum-M, Breech-S, Shoulder-Sc or A).

3 The last letter tells which half of the pelvis the reference point is in (anterior-A, posterior-P, transverse or in the middle-T).

(b) Each presenting part has the possibility of six positions. They are normally recognized for each position–using “occiput” as the reference point.

1 Left occiput anterior (LOA).

2 Left occiput posterior (LOP).

3 Left occiput transverse (LOT).

4 Right occiput anterior (ROA).

5. Right occiput posterior (ROP).

6 Right occiput transverse (ROT).

(c) A transverse position does not use a first letter and is not the same as a transverse lie or presentation.

1 Occiput at sacrum (O.S.) or occiput at posterior (O.P.).

2 Occiput at pubis (O.P.) or occiput at anterior (O.A.).

(4) Types of breech presentations (see figure10-4).

(a) Complete or full breech. This involves flexion of the fetus legs. It looks like the fetus is sitting in a tailor fashion. The buttocks and feet appear at the vaginal opening almost simultaneously.

A–Complete. B–Frank. C–Incomplete.

(b) Frank and single breech. The fetus thighs are flexed on his abdomen. His legs are against his trunk and feet are in his face (foot-in-mouth posture). This is the most common and easiest breech presentation to deliver.

(c) Incomplete breech. The fetus feet or knees will appear first. His feet are labeled single or double footing, depending on whether 1 or 2 feet appear first.

(5) Observations about positions (see figure 10-5).

(a) LOA and ROA positions are the most common and permit relatively easy delivery.

(b) LOP and ROP positions usually indicate labor may be longer and harder, and the mother will experience severe backache.

(c) Knowing positions will help you to identify where to look for FHT’s.

1 Breech. This will be upper R or L quad, above the umbilicus.

2 Vertex. This will be lower R or L quad, below the umbilicus.

(d) An occiput in the posterior quadrant means that you will feel lumpy fetal parts, arms and legs (see figure 10-5 A). If delivered in that position, the infant will come out looking up.

(e) An occiput in the anterior quadrant means that you will feel a more smooth back (see figure 10-5 B). If delivered in that position, the infant will come out looking down at the floor.

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Breech Births

In the last weeks of pregnancy, a baby usually moves so his or her head is positioned to come out of the vagina first during birth. This is called a vertex presentation. A breech presentation occurs when the baby’s buttocks, feet, or both are positioned to come out first during birth. This happens in 3–4% of full-term births.

What are the different types of breech birth presentations?

• Complete breech: Here, the buttocks are pointing downward with the legs folded at the knees and feet near the buttocks.
• Frank breech: In this position, the baby’s buttocks are aimed at the birth canal with its legs sticking straight up in front of his or her body and the feet near the head.
• Footling breech: In this position, one or both of the baby’s feet point downward and will deliver before the rest of the body.

What causes a breech presentation?

The causes of breech presentations are not fully understood. However, the data show that breech birth is more common when:

• You have been pregnant before
• In pregnancies of multiples
• When there is a history of premature delivery
• When the uterus has too much or too little amniotic fluid
• When there is an abnormally shaped uterus or a uterus with abnormal growths, such as fibroids
• The placenta covers all or part of the opening of the uterus placenta previa

How is a breech presentation diagnosed?

A few weeks prior to the due date, the health care provider will place her hands on the mother’s lower abdomen to locate the baby’s head, back, and buttocks. If it appears that the baby might be in a breech position, they can use ultrasound or pelvic exam to confirm the position. Special x-rays can also be used to determine the baby’s position and the size of the pelvis to determine if a vaginal delivery of a breech baby can be safely attempted.

Can a breech presentation mean something is wrong?

Even though most breech babies are born healthy, there is a slightly elevated risk for certain problems. Birth defects are slightly more common in breech babies and the defect might be the reason that the baby failed to move into the right position prior to delivery.

Can a breech presentation be changed?

It is preferable to try to turn a breech baby between the 32nd and 37th weeks of pregnancy . The methods of turning a baby will vary and the success rate for each method can also vary. It is best to discuss the options with the health care provider to see which method she recommends.

Medical Techniques

External Cephalic Version (EVC)  is a non-surgical technique to move the baby in the uterus. In this procedure, a medication is given to help relax the uterus. There might also be the use of an ultrasound to determine the position of the baby, the location of the placenta and the amount of amniotic fluid in the uterus.

Gentle pushing on the lower abdomen can turn the baby into the head-down position. Throughout the external version the baby’s heartbeat will be closely monitored so that if a problem develops, the health care provider will immediately stop the procedure. ECV usually is done near a delivery room so if a problem occurs, a cesarean delivery can be performed quickly. The external version has a high success rate and can be considered if you have had a previous cesarean delivery.

ECV will not be tried if:

• You are carrying more than one fetus
• There are concerns about the health of the fetus
• You have certain abnormalities of the reproductive system
• The placenta is in the wrong place
• The placenta has come away from the wall of the uterus ( placental abruption )

Complications of EVC include:

• Prelabor rupture of membranes
• Changes in the fetus’s heart rate
• Placental abruption
• Preterm labor

Vaginal delivery versus cesarean for breech birth?

Most health care providers do not believe in attempting a vaginal delivery for a breech position. However, some will delay making a final decision until the woman is in labor. The following conditions are considered necessary in order to attempt a vaginal birth:

• The baby is full-term and in the frank breech presentation
• The baby does not show signs of distress while its heart rate is closely monitored.
• The process of labor is smooth and steady with the cervix widening as the baby descends.
• The health care provider estimates that the baby is not too big or the mother’s pelvis too narrow for the baby to pass safely through the birth canal.
• Anesthesia is available and a cesarean delivery possible on short notice

What are the risks and complications of a vaginal delivery?

In a breech birth, the baby’s head is the last part of its body to emerge making it more difficult to ease it through the birth canal. Sometimes forceps are used to guide the baby’s head out of the birth canal. Another potential problem is cord prolapse . In this situation the umbilical cord is squeezed as the baby moves toward the birth canal, thus slowing the baby’s supply of oxygen and blood. In a vaginal breech delivery, electronic fetal monitoring will be used to monitor the baby’s heartbeat throughout the course of labor. Cesarean delivery may be an option if signs develop that the baby may be in distress.

When is a cesarean delivery used with a breech presentation?

Most health care providers recommend a cesarean delivery for all babies in a breech position, especially babies that are premature. Since premature babies are small and more fragile, and because the head of a premature baby is relatively larger in proportion to its body, the baby is unlikely to stretch the cervix as much as a full-term baby. This means that there might be less room for the head to emerge.

Want to Know More?

• Creating Your Birth Plan
• Labor & Birth Terms to Know
• Cesarean Birth After Care

Compiled using information from the following sources:

• ACOG: If Your Baby is Breech
• William’s Obstetrics Twenty-Second Ed. Cunningham, F. Gary, et al, Ch. 24.
• Danforth’s Obstetrics and Gynecology Ninth Ed. Scott, James R., et al, Ch. 21.

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