For most people with a breech baby at term, an external cephalic version (ECV) is worth attempting. The procedure succeeds about 58% of the time, and when it works, roughly 80% of those patients go on to deliver vaginally. The risk of a serious complication is low, with emergency cesarean rates during or after the procedure falling between 0.2% and 0.7%. That said, your individual odds depend on several factors, and understanding them can help you make a more confident decision.
What the Success Rates Actually Look Like
The headline number is 58%, meaning a little more than half of all ECV attempts result in the baby turning head-down. But that average masks a wide range. If this is your second or later pregnancy, your chances are roughly three times higher than a first-time parent’s, largely because your uterine and abdominal muscles are more relaxed. In one large study, having had a previous birth was one of the strongest independent predictors of success.
Several other factors shift the odds meaningfully:
- Placenta location: An anterior placenta (on the front wall of the uterus) drops the success rate to about 35%. Other placental positions don’t appear to make a significant difference.
- Amniotic fluid levels: Higher fluid gives the baby more room to rotate. An amniotic fluid index at or above 10.6 cm is associated with better outcomes.
- Breech type: A frank breech, where the baby’s legs are folded up toward the head, has the lowest success rate at around 39%. Complete and footling breech presentations do better.
- Baby’s spine position: If the baby’s spine faces toward your back (posterior), the success rate drops to about 14%.
- Weight gain during pregnancy: Gaining less weight overall (a BMI increase under about 3.85 points) is linked to lower success, likely because it correlates with less room for the baby to move.
- Anesthesia: Having a spinal or epidural during the procedure roughly triples the odds of success compared to no anesthesia, because it relaxes the abdominal wall and reduces pain-related tensing.
Your provider can assess most of these factors with an ultrasound beforehand, which gives you a much better estimate than the 58% average alone.
What Happens After a Successful Turn
A successful ECV doesn’t guarantee a vaginal delivery, but it makes one far more likely. In one study of 62 patients whose babies were successfully turned, about 79% delivered vaginally without complications and another 1.6% delivered vaginally with assistance. The remaining 19% still needed a cesarean during labor for other medical reasons, which is comparable to the general cesarean rate for head-down babies.
There is a chance the baby flips back to breech after a successful ECV. In a study of 169 successful versions, 28 babies (about 17%) reverted to breech. The good news: a second ECV attempt in those cases succeeded 76% of the time. So even a reversion doesn’t necessarily end your chance at a vaginal birth.
How It Feels
ECV involves firm, sustained pressure on your abdomen as the provider manually guides the baby into a head-down position. It’s uncomfortable, and for some people it’s genuinely painful. In a study of 98 women who had the procedure without any pain relief, the median pain score was 5.7 out of 10. About 28% rated their pain below 3, while roughly 20% scored it above 7. One person gave it a full 10.
Pain tends to be lower when the procedure goes smoothly. Women whose ECV succeeded reported a median pain score of 4.6, compared to 6.8 for those whose attempt failed. The harder the provider has to work to move the baby, the more it hurts. Either way, the actual manipulation is brief, and most patients tolerate it well because of that short duration. Many hospitals now offer spinal anesthesia during ECV, which both reduces pain and improves the chance of success.
The Risks in Perspective
The most serious concern is fetal distress during the procedure, which is why ECV is performed in a hospital with continuous heart rate monitoring and an operating room on standby. The rate of emergency cesarean during or immediately after the procedure is between 0.2% and 0.7%, most commonly triggered by an abnormal fetal heart rate pattern. In practical terms, that means roughly 1 in 150 to 1 in 500 procedures lead to an urgent delivery.
When ECV fails, there are some slightly elevated risks compared to babies who were simply breech without an attempted version. These include a modestly higher chance of premature rupture of membranes and a small increase in the likelihood of low Apgar scores at birth. These risks are statistically significant but still uncommon in absolute terms, and they apply specifically to failed attempts, not successful ones.
The Financial Picture
An ECV attempt costs roughly $1,024 in total (including the provider’s fee and your time), compared to about $8,023 for a planned cesarean or $5,581 for a vaginal delivery. When you factor in the 58% success rate and the downstream delivery costs, attempting ECV costs about $79 more on average than going straight to a scheduled cesarean. But it results in slightly better overall health outcomes.
The math tips even further in ECV’s favor when the chance of success is higher. Economic modeling shows that when the probability of a successful turn exceeds 63%, an ECV attempt actually costs less overall than a scheduled cesarean while also producing better outcomes. So if you have favorable factors (second pregnancy, good fluid levels, non-anterior placenta), the financial case becomes straightforward.
Who Should Think Twice
ECV isn’t offered to everyone. It’s typically not recommended if you have a low-lying placenta, are carrying multiples, have certain uterine abnormalities, or if there are already concerns about the baby’s heart rate pattern. If you’ve had a previous cesarean, the procedure can still be attempted, but in one small series of four such patients, three of the four who had a successful ECV still ended up delivering by cesarean.
For first-time parents with an anterior placenta and a frank breech, the individual success rate may be well below 35%. At that point, the procedure is still safe to attempt, but you should weigh the moderate discomfort and hospital visit against what may be closer to a one-in-three chance of it working. Some people in that situation decide the attempt is still worthwhile because the downside is low. Others prefer to plan a cesarean and skip the uncertainty. Neither choice is wrong.
Making the Decision
The core tradeoff is a brief, uncomfortable procedure with a small chance of complication versus the possibility of avoiding major abdominal surgery and a longer recovery. For most people, the math favors trying. You have better-than-even odds of success, an 80% chance of vaginal delivery if it works, and a very low risk of anything going seriously wrong. Recovery from a vaginal birth is typically faster, less painful, and involves fewer restrictions than recovery from a cesarean.
Ask your provider about your specific predictors. An ultrasound can tell you where your placenta sits, how much fluid surrounds the baby, what type of breech presentation you have, and where the baby’s spine is oriented. Those details will give you a much more useful estimate than the average 58%, and that personalized number is what should drive your decision.