Pregnancy, labor, and delivery are different for every woman and difficult to predict. Even if your first pregnancy required a cesarean, the next one may not. The likelihood of a successful vaginal birth after cesarean (VBAC) is influenced by many things. Usually a combination of things affects how well or poorly a trial of labor goes.
Your chances of a successful VBAC are best when:1
- Your previous cesarean was not done for stalled labor.
- You do not have the same condition that led to a previous cesarean (such as a breech, or feet-down, fetus).
- You have had a vaginal delivery or a successful VBAC before.
- Your labor starts on its own and your cervix dilates well.
- You are younger than 35.2
Your chances of a successful VBAC are lower when:2
- Your previous cesarean was because of difficult labor, which is called dystocia. This is especially true if you were fully dilated when you had a cesarean section for dystocia.
- You are obese.
- You are older than 35. 2
- Your fetus is very large [estimated as bigger than 9 lb (4082 g)].
- You are beyond 40 weeks of pregnancy.
- Your last pregnancy was less than 18 months ago.
VBAC can be considered for pregnancies with twins.