VBAC stands for vaginal birth after cesarean, meaning a woman delivers vaginally in a pregnancy following a previous C-section. For decades, the standard approach was “once a cesarean, always a cesarean,” but that thinking has shifted significantly. Most women with one prior C-section are candidates to attempt a vaginal delivery, and success rates are around 60 to 80 percent depending on individual factors.
VBAC vs. TOLAC: What the Terms Mean
You’ll often hear two terms used together. TOLAC, or trial of labor after cesarean, refers to the attempt itself. VBAC refers to the outcome: a successful vaginal delivery. Every VBAC starts as a TOLAC, but not every TOLAC ends in a VBAC. Some women who attempt labor will still need a C-section during the process. Understanding this distinction helps frame the decision, because you’re really choosing whether to attempt labor, not guaranteeing a vaginal birth.
Why More Women Are Choosing It
A successful VBAC offers clear advantages over a repeat C-section. There’s no abdominal surgery, which means a lower risk of infection and serious blood loss, a shorter hospital stay, and a faster return to daily life. Babies born vaginally also have a lower risk of breathing problems after birth.
The benefits extend beyond the current pregnancy. Each additional C-section increases the risk of serious complications in future pregnancies, including life-threatening bleeding, abnormal placenta placement, and conditions where the placenta grows into the uterine wall. Women planning larger families stand to gain the most from a successful VBAC, since it breaks the cycle of accumulating surgical risk with each pregnancy.
Who Is a Good Candidate
The strongest single predictor of VBAC success is having had a previous vaginal delivery, whether before or after the cesarean. The type of incision made on the uterus during the prior C-section also matters. A low horizontal (transverse) incision is the standard type and the safest for a future labor attempt. Absolute contraindications include a previous vertical or inverted T-shaped uterine incision, a history of uterine rupture, or major uterine reconstruction such as fibroid removal surgery.
Several other factors influence the likelihood of success. The Maternal-Fetal Medicine Units Network developed a calculator that weighs maternal age, height, pre-pregnancy weight, BMI, whether the prior C-section was done because labor stalled, and whether you have chronic hypertension. A version used at hospital admission also factors in cervical dilation, how thin the cervix has become, the baby’s position, and gestational age. Your provider can use these tools to give you a personalized probability rather than a generic statistic.
What the Risks Look Like
The most serious risk of attempting labor after a cesarean is uterine rupture, where the scar from the previous surgery opens during contractions. For women with one prior C-section, this happens in roughly 0.7 percent of attempts. It’s rare, but when it occurs it’s a surgical emergency requiring an immediate C-section to protect both mother and baby.
The other key risk is that the TOLAC doesn’t succeed. When a woman labors and then needs an unplanned C-section, her risks of postpartum infection, excessive bleeding, and wound complications are higher than if she had scheduled a repeat C-section from the start. This is one reason the personalized probability matters: a woman with a 75 percent chance of success faces a very different risk calculation than one with a 40 percent chance.
Attempting VBAC After Two C-Sections
Vaginal birth after two cesareans (sometimes called VBA2C) is less common but not off the table. A large meta-analysis found a 72 percent success rate across more than 3,000 cases. The uterine rupture rate is higher than after a single cesarean, around 1.4 percent compared to 0.7 percent, so the conversation with your provider becomes more nuanced.
Other outcomes are worth weighing. NICU admission rates were actually slightly lower for VBA2C babies (9.5 percent) compared to those born by a third C-section (11.2 percent). However, the rate of low Apgar scores at five minutes was about twice as high in the VBA2C group, and perinatal mortality, while rare in both groups, was also roughly double (2.3 percent vs. 1.1 percent). These numbers reinforce that attempting labor after two cesareans is a reasonable option for some women, but one that requires careful individual assessment.
How Induction Affects the Process
Some women attempting a VBAC go into labor spontaneously, which is the ideal scenario. Others need labor to be started or sped along. Induction with a mechanical method alone (such as a catheter balloon placed in the cervix) resulted in vaginal delivery in about 57 percent of cases in one study. Adding medication to strengthen contractions during active labor improved delivery rates, but combining multiple induction methods increased maternal complications from about 5 percent to nearly 18 percent without improving the chance of a vaginal birth. The approach your care team takes to start or support labor can meaningfully shift the risk-benefit balance.
What Hospitals Need to Have in Place
Not every hospital offers VBAC. Professional guidelines specify that a trial of labor should happen in a facility equipped to perform an emergency C-section, with surgical and anesthesia staff available to act quickly. About 68 percent of hospitals in one U.S. survey changed their policies to require surgical and anesthesia personnel to be physically present in the building when a VBAC patient is in labor. In practice, this means smaller or rural hospitals may not offer the option, and you may need to plan to deliver at a larger facility. It’s worth confirming your hospital’s policy early in pregnancy so you have time to make arrangements.
Making the Decision
The choice between a TOLAC and a scheduled repeat C-section is genuinely personal. It depends on why you had your previous cesarean, how many children you plan to have, your individual health profile, and what matters most to you about the birth experience and recovery. A woman whose prior C-section was done for a breech baby has different odds than one whose labor stalled at full dilation. Someone planning one more child faces a different long-term risk picture than someone hoping for three or four.
The best starting point is an early conversation with your provider about your specific history, your personalized success probability, and the resources available at your planned delivery hospital. That information turns a general concept into a concrete plan you can evaluate for yourself.