VBAC stands for vaginal birth after cesarean, and it means delivering a baby vaginally when you’ve had a previous C-section. About 60% to 80% of women who attempt it succeed. The term you’ll hear from your care team is TOLAC, or “trial of labor after cesarean,” which refers to the attempt itself. VBAC is the outcome when that attempt works.
How VBAC Differs From a Standard Vaginal Birth
The labor process itself feels the same as any vaginal delivery. Contractions, pushing, and recovery all follow the same general pattern. The difference is what’s happening behind the scenes: your care team is monitoring you more closely because you have a scar on your uterus from your previous cesarean. That scar creates a small but real risk that the uterus could tear open during contractions, a complication called uterine rupture.
For women with one prior low-transverse C-section (the most common type, where the incision runs horizontally across the lower uterus), the risk of uterine rupture is approximately 0.3% to 0.7%. That’s roughly 1 in 200 labors. The risk rises with other incision types: about 2% for a prior low vertical incision and close to 2% for classical (up-and-down) incisions. This is why your provider will want to know exactly what type of incision was used in your previous surgery, not just the scar on your skin, but the one on your uterus.
Success Rates and What Predicts Them
In clinical studies, VBAC success rates hover around 79% for carefully selected candidates. Your individual odds depend on several specific factors. The strongest predictor of success is whether you’ve ever had a vaginal delivery before. Women with a prior vaginal birth are roughly three times more likely to succeed, and women who’ve had a previous successful VBAC are nearly five times more likely to do it again.
Factors that lower your chances include being 35 or older, having a higher BMI, needing labor to be induced or augmented rather than starting naturally, carrying a baby estimated at over 4,000 grams (about 8 pounds 13 ounces), and having had your prior C-section because labor stalled during pushing. Spontaneous labor, where contractions begin on their own, nearly doubles the odds of success compared to induction.
Doctors in the U.S. often use a prediction tool developed by the Maternal-Fetal Medicine Units Network that plugs in six variables you can discuss at your first prenatal visit: your age, BMI, race, history of vaginal delivery, prior VBAC, and the reason for your previous cesarean. The result is a personalized percentage that helps you and your provider weigh the decision together.
Benefits Over a Repeat Cesarean
A successful VBAC avoids major abdominal surgery, which means a shorter hospital stay, less pain in recovery, and a faster return to normal activity. You also avoid the risks that come with any surgical procedure: infection, blood loss, blood clots, and injury to nearby organs.
The benefits compound if you plan to have more children. Each additional cesarean raises the likelihood of serious complications in future pregnancies, including placenta previa (where the placenta covers the cervix), placenta accreta spectrum (where the placenta grows too deeply into the uterine wall), and emergency hysterectomy. Choosing VBAC now can reduce those cumulative surgical risks down the road.
The Main Risk: Uterine Rupture
Uterine rupture is rare but serious. When the scar from a prior C-section gives way during labor, it can cause heavy bleeding in the mother and cut off oxygen to the baby. Emergency cesarean delivery within minutes is required. This is the central reason VBAC carries different planning requirements than a routine vaginal birth.
Induced or augmented labor increases the rupture risk by two to three times compared to spontaneous labor. Certain cervical ripening medications have inconsistent safety data for VBAC candidates, and guidelines from ACOG recommend they be used only in women with a strong likelihood of success. Mechanical methods like a Foley catheter are sometimes used as an alternative, though they carry a slightly higher risk of infection. Your provider will discuss whether induction is appropriate for your specific situation or whether waiting for spontaneous labor is safer.
How Long to Wait Between Pregnancies
The time between your cesarean and your next pregnancy matters. International guidelines generally recommend waiting at least nine months between delivery and the next conception. But a large population study found that the risk of uterine rupture continues to drop as the gap widens, reaching its lowest point at about 21 months between pregnancies and then leveling off. If you’re planning a VBAC, spacing your pregnancies with that timeline in mind gives your uterine scar the most time to heal and strengthens your safety margin.
What Your Hospital Needs to Have in Place
Not every hospital or birth center offers VBAC. Guidelines require that facilities attempting TOLAC be able to perform an emergency cesarean quickly if something goes wrong. In practice, this means a surgeon credentialed to perform a C-section, an anesthesia provider, and an operating room team all need to be reachable on short notice. For higher-risk patients, these staff members should be on campus and free of other responsibilities during active labor, with an operating room already open and staffed.
If you’re considering VBAC, one of the first practical steps is confirming that your hospital supports it and understanding their specific staffing model. Some smaller or rural hospitals don’t have the around-the-clock surgical coverage required, which can limit your options. Your OB or midwife can help you identify a facility that meets the safety criteria, and it’s worth having that conversation early in pregnancy rather than in the third trimester.
What the Experience Looks Like
If you and your provider decide TOLAC is a good fit, your prenatal care will be mostly the same as any pregnancy, with extra attention to your surgical history. You’ll be asked to obtain your operative report from your previous C-section so your team knows your incision type. As your due date approaches, you’ll discuss a plan for what happens if labor starts on its own versus what happens if it doesn’t.
During labor, you’ll typically have continuous fetal monitoring so your team can spot any signs of distress that might indicate uterine rupture. You can still receive an epidural. If labor progresses normally and your baby tolerates contractions well, delivery proceeds just like any vaginal birth. If complications arise or labor stalls, your team will move to a cesarean. About 1 in 5 women who attempt TOLAC end up with a repeat C-section, and while that can feel disappointing, it’s a built-in part of the plan rather than a failure of it.
Recovery after a successful VBAC is typically faster than after a cesarean. Most women go home within one to two days and can resume light activity sooner, since there’s no abdominal incision healing. If the attempt results in an unplanned C-section, recovery is similar to any cesarean delivery.