ECV, or external cephalic version, is a hands-on procedure where a doctor manually turns a baby from a breech (feet-first or bottom-first) position into a head-down position. It’s performed late in pregnancy to improve the chances of a vaginal delivery and avoid a cesarean section. About 3 to 4 percent of babies are still breech near the end of pregnancy, and ECV is the primary non-surgical option for correcting that.
How the Procedure Works
During an ECV, you lie on your back while a doctor places both hands on your abdomen and applies firm, steady pressure to guide the baby into a forward or backward somersault. The goal is to move the baby’s head downward toward your pelvis. An ultrasound is used before and during the procedure to confirm the baby’s position, locate the placenta, and check amniotic fluid levels. Your baby’s heart rate is monitored continuously throughout.
Before starting, you’ll typically receive medication through an IV to relax your uterus and prevent contractions. The actual turning attempt usually takes only a few minutes, though the entire appointment (including monitoring) lasts longer. Most people describe the sensation as uncomfortable pressure rather than sharp pain, though the intensity varies. If the baby resists or the heart rate drops, the doctor stops immediately.
When It’s Done
ECV is most commonly performed between 36 and 38 weeks of pregnancy. At this stage the baby is large enough that spontaneous flipping becomes unlikely, but there’s still enough amniotic fluid and room to attempt the turn. A multicenter trial across 25 centers in seven countries found that attempting ECV earlier, between 34 and 36 weeks, may reduce the chance of the baby still being breech at delivery compared to waiting until 37 to 38 weeks. However, earlier attempts also carry a small risk of preterm complications, so the standard window for most patients remains around 37 weeks.
For people who have had previous pregnancies, the uterus and abdominal wall tend to be more relaxed, which can make the procedure easier. First-time mothers generally have tighter abdominal muscles, which can make turning the baby more challenging.
Success Rates
ECV succeeds roughly 50 to 60 percent of the time overall. Success rates are higher for women who have been pregnant before (closer to 60 percent or above) and lower for first pregnancies (closer to 40 percent). Several factors influence whether the procedure works: the amount of amniotic fluid, where the placenta is located, how far the baby’s back is from the front of your abdomen, and your body weight. A small percentage of babies who are successfully turned will flip back to breech before labor begins, though this is uncommon when the procedure is done close to term.
Who Can Have an ECV
Not everyone with a breech baby is a candidate. Your provider will evaluate several factors before recommending the procedure. Conditions that make ECV unsafe include:
- Placenta previa (the placenta covers the cervix)
- Recent vaginal bleeding
- Low amniotic fluid
- Carrying multiples (twins or more)
- Abnormal fetal heart rate
- An irregularly shaped uterus
- Ruptured membranes (your water has broken)
- A baby with a hyperextended head (tilted far back)
Certain conditions don’t rule it out entirely but do make success less likely. These include obesity, a baby measuring small for gestational age (below the 10th percentile), and a previous cesarean scar. If you’ve had a prior C-section, your provider will weigh the small risk of uterine stress against the benefits of avoiding another surgical delivery. High blood pressure and diabetes also require careful evaluation before proceeding.
What Happens After the Procedure
After an ECV attempt, whether successful or not, your baby’s heart rate is monitored for a period to confirm everything looks normal. You can expect to stay at the hospital or clinic for observation, though most people go home the same day.
If you have Rh-negative blood, you’ll receive a shot of Rh immune globulin (commonly known as RhoGAM) after the procedure. The pressure applied during ECV can cause a small amount of the baby’s blood to cross into your circulation, and if your baby is Rh-positive, this injection prevents your immune system from developing antibodies that could affect future pregnancies. After any blood product like this, you’ll be observed for at least 20 minutes for signs of a reaction.
Some soreness or tenderness in your abdomen is normal for a day or two afterward. If the procedure was successful, your provider will confirm the baby’s position at your next appointment and plan for a normal vaginal delivery. If the baby didn’t turn, you’ll discuss next steps, which typically include scheduling a cesarean delivery or, in some cases, attempting the procedure again.
Risks to Know About
ECV is considered a safe procedure, but it isn’t risk-free. The most common issue is temporary changes in the baby’s heart rate during the attempt, which almost always resolve once the pressure stops. Serious complications are rare but can include placental abruption (the placenta separating from the uterine wall), preterm labor, or cord compression. The risk of an emergency cesarean section during or shortly after an ECV is estimated at around 1 to 2 percent. Because of these possibilities, the procedure is always performed in a hospital setting where an operating room is available if needed.
For most people with a breech baby at term, the benefits of attempting an ECV outweigh the risks. A successful version avoids the recovery time, surgical risks, and longer hospital stay that come with a cesarean delivery, and it preserves options for future pregnancies as well.