An ECV, or external cephalic version, is a medical procedure used to turn a baby from a breech position (feet or bottom first) into a head-down position before labor begins. When successful, it allows you to have a vaginal delivery instead of a planned cesarean section. The procedure is performed by a doctor who uses their hands on your belly to physically guide the baby into the correct position, typically after 37 weeks of pregnancy.
Why an ECV Is Performed
Most babies settle into a head-down position on their own by the third trimester. About 3 to 4 percent don’t. When a baby remains breech, transverse (sideways), or oblique (at an angle) near your due date, a cesarean delivery is the standard approach because vaginal breech births carry higher risks. An ECV gives you a chance to avoid that surgery.
The procedure is typically offered at or after 37 weeks of gestation. Doing it earlier means the baby has more room to flip back to breech, and performing it before term would carry risk if an emergency delivery became necessary. At 37 weeks, the baby is considered full term and could be safely delivered if any complications arose during the attempt.
What Happens During the Procedure
An ECV is done in a hospital, not a clinic, because the medical team needs to be ready to perform an emergency cesarean if needed. Before the procedure begins, you’ll have an ultrasound to confirm the baby’s position, check the amount of amniotic fluid, and locate the placenta. A fetal heart rate monitor is placed on your belly to track the baby’s response throughout.
To make the procedure easier, you may receive a medication that temporarily relaxes your uterine muscles. This keeps the uterus soft and pliable, which gives the doctor more room to work. A relaxed uterus is one of the strongest predictors of success.
The doctor then places both hands on your abdomen and applies firm, steady pressure to guide the baby through a slow somersault. One hand cradles the baby’s head while the other lifts the bottom. The goal is to move the baby in a forward roll so the head shifts downward toward your pelvis. The whole maneuver typically takes just a few minutes, though it can feel much longer.
How It Feels
Most people describe an ECV as uncomfortable, and some find it painful. The level of discomfort varies widely. The doctor is pressing firmly through layers of skin, muscle, and uterine wall to move a full-sized baby, so the pressure is significant. Research shows that patients who experience less pain during the procedure have substantially higher success rates, likely because less pain means the uterine muscles are more relaxed and the baby can move more freely.
Pain management options vary by hospital. Some centers offer regional anesthesia (similar to an epidural) to reduce discomfort and improve your ability to relax. Others rely on the uterine-relaxing medication alone. If you’re concerned about pain, ask your provider ahead of time what options are available at your facility.
Success Rates and What Affects Them
ECV succeeds roughly 50 to 70 percent of the time, with some studies reporting rates above 70 percent depending on the population. Several factors influence whether the procedure will work for you.
- Uterine tone: A soft, relaxed uterus makes success nearly four times more likely compared to a tense one. This is partly why the uterine-relaxing medication is given beforehand.
- Placenta location: A placenta attached to the back wall of the uterus (posterior placenta) is associated with higher success rates than one on the front wall (anterior placenta). A front-wall placenta creates a barrier the doctor has to work around.
- Amniotic fluid levels: More fluid gives the baby room to rotate. Low fluid levels make the procedure more difficult and can be a reason not to attempt it.
Interestingly, whether this is your first pregnancy or a subsequent one doesn’t appear to make a significant statistical difference in success, though some providers still consider it a factor because the abdominal wall tends to be more flexible in people who have delivered before.
Even after a successful ECV, there’s a small chance the baby will flip back to breech before labor starts. Your provider will monitor the baby’s position in the weeks that follow.
Risks and Complications
ECV is considered a low-risk procedure, but it’s not risk-free, which is why it’s always done in a hospital with surgical teams available. The most serious potential complications are rare. A large review of over 7,300 ECV attempts found that placental abruption (the placenta separating from the uterine wall) occurred in just 0.12 percent of cases. Emergency cesarean delivery during or immediately after the procedure is needed in 0.2 to 0.7 percent of cases, most often because of changes in the baby’s heart rate pattern.
Other uncommon risks include temporary changes in fetal heart rate that resolve on their own, premature rupture of membranes, and cord complications. The fetal heart rate is monitored continuously during and after the procedure specifically to catch these issues early.
If your blood type is Rh-negative, you’ll receive an injection of Rh immune globulin (commonly known as RhoGAM) after the procedure. The manipulation can cause a small amount of fetal blood to cross into your circulation, and this injection prevents your immune system from developing antibodies that could affect this or future pregnancies.
Who Should Not Have an ECV
Certain conditions make the procedure unsafe. Low amniotic fluid (oligohydramnios) is the one contraindication that appears consistently across all medical guidelines. Beyond that, reasons to avoid ECV generally fall into two categories.
Maternal factors include conditions where the uterus shouldn’t be manipulated, such as placenta previa (when the placenta covers the cervix), a history of significant uterine surgery, active vaginal bleeding, or signs that labor has already started. Fetal factors include concerns about the baby’s wellbeing, such as abnormal heart rate tracings, known growth restriction, or certain umbilical cord abnormalities. If you’re carrying twins or higher-order multiples, ECV is also not typically offered.
Your provider will review your specific situation, including ultrasound findings and your medical history, to determine whether the procedure is a reasonable option for you.
What Happens After the Procedure
After the ECV attempt, whether successful or not, you’ll be monitored in the hospital for a period of time. The medical team will watch the baby’s heart rate to make sure there are no signs of distress. If the procedure worked, you’ll go home and continue your pregnancy with the expectation of a normal vaginal delivery. Your provider will check the baby’s position at your remaining prenatal visits.
If the ECV didn’t work, you have a couple of options. Some providers will offer a second attempt on a different day, since conditions like uterine tone and baby positioning change over time. If the baby remains breech, a planned cesarean section is typically scheduled around 39 weeks. In rare cases, a provider experienced in vaginal breech delivery may discuss that option with you, though most hospitals no longer offer it routinely.