While the choice for how to bring a child into the world is deeply personal, the data paints a compelling picture: for most women with one prior cesarean, planning a VBAC carries a 60-80% success rate alongside significantly lower risks of maternal complications and a faster recovery compared to a repeat surgical delivery.
Key Takeaways
- Overall VBAC success rate is 60-80% for women with one prior low transverse cesarean incision
- VBAC success rate reaches 91% for women with one prior vaginal delivery and one prior cesarean
- Spontaneous labor onset correlates with 75-85% VBAC success compared to 50-65% with induction
- Uterine rupture risk is 0.5-0.9% for women with one prior low transverse cesarean attempting VBAC
- Risk of uterine rupture increases to 1.8-3.7% with prostaglandin induction for VBAC
- Oxytocin use raises rupture risk to 1.0-1.5% vs 0.6% without
- VBAC transfusion risk 1.5% vs 2.8% repeat cesarean
- Hysterectomy risk 0.4% after uterine rupture in VBAC
- Maternal infection rate 4.2% VBAC vs 8.1% repeat cesarean
- NICU admission 4.9% VBAC vs 7.2% elective repeat cesarean
- Perinatal mortality 1.1/1,000 VBAC vs 1.2/1,000 repeat cesarean
- Hypoxic-ischemic encephalopathy 0.15% VBAC rupture cases
- Prior vaginal birth increases VBAC success by 2-3 fold (OR 2.5)
- Spontaneous labor most favorable predictor (success OR 3.2)
- Shorter stature (<155cm) reduces success (OR 0.6)
VBAC success is likely for most mothers with a prior cesarean.
Fetal Neonatal Outcomes
1NICU admission 4.9% VBAC vs 7.2% elective repeat cesarean
Verified2Perinatal mortality 1.1/1,000 VBAC vs 1.2/1,000 repeat cesarean
Verified3Hypoxic-ischemic encephalopathy 0.15% VBAC rupture cases
Verified45-minute Apgar <7: 1.8% VBAC vs 2.5% cesarean
Directional5Neonatal sepsis 1.2% VBAC vs 2.1% repeat cesarean
Single source6Meconium aspiration 0.8% VBAC vs 1.4% cesarean
Verified7Umbilical cord pH <7.0: 0.9% after rupture
Verified8Respiratory distress syndrome 2.3% VBAC vs 3.8% cesarean
Verified9Birth asphyxia 0.3% VBAC vs 0.5% elective repeat
Directional10Neonatal transfusion 0.4% VBAC vs 1.1% cesarean
Single source11Long-term neurodevelopmental issues no difference (OR 1.02)
Verified12Cerebral palsy risk 0.12% VBAC vs 0.15% cesarean
Verified13Jaundice requiring phototherapy 5.2% VBAC vs 6.8% cesarean
Verified14Shoulder dystocia 1.5% VBAC vs 0.2% cesarean
Directional15Brachial plexus injury 0.2% VBAC post-dystocia
Single source16NICU >3 days 2.1% VBAC vs 4.3% cesarean
Verified17Transient tachypnea newborn 3.1% VBAC vs 5.9% cesarean
Verified18Fetal distress leading to cesarean 12% VBAC attempts
Verified19Neonatal death 0.15/1,000 VBAC vs 0.18/1,000 repeat
Directional20Hypoglycemia 4.5% VBAC vs 6.2% cesarean
Single source21Ventilator support 0.5% VBAC vs 1.2% cesarean
Verified22Intracranial hemorrhage 0.05% rupture cases
Verified23Breastfeeding exclusivity higher 65% VBAC vs 55% cesarean at 6 months
VerifiedFetal Neonatal Outcomes Interpretation
While the slightly higher odds of shoulder dystocia during a VBAC are real, the overall neonatal ledger reads like a compelling case for letting a proven pelvis have another go, given the consistently lower rates of NICU vacations, respiratory distress, infections, and jaundice, plus a bonus for breastfeeding, all with no long-term brain development downside.
Influencing Factors
1Prior vaginal birth increases VBAC success by 2-3 fold (OR 2.5)
Verified2Spontaneous labor most favorable predictor (success OR 3.2)
Verified3Shorter stature (<155cm) reduces success (OR 0.6)
Verified4Recurrent indication halves success odds (OR 0.5)
Directional5Maternal age >35 years decreases success (OR 0.7)
Single source6BMI >30 kg/m² lowers odds (OR 0.4 per 5-unit increase)
Verified7Gestational diabetes reduces success (OR 0.65)
Verified8Estimated fetal weight >4000g decreases OR 0.55
Verified9Labor induction lowers success (OR 0.4)
Directional10Provider counseling increases attempt rate 25%
Single source11Hospital VBAC rate >15% boosts individual success 10%
Verified12Interdelivery interval >18 months OR 1.4 success
Verified13Cervical Bishop score ≥6 predicts 85% success
Verified14Ethnicity influences: Asian OR 1.2 success
Directional15Insurance status: private OR 1.3 vs public
Single source16Prior postpartum hemorrhage OR 0.7 success
Verified17Ultrasound EFW accuracy <10% error OR 1.5 success
Verified18Continuous EFM availability increases attempts 30%
Verified19Midwife-led care OR 2.1 VBAC success
Directional20Smoking status no effect (OR 0.95)
Single source21Parity ≥2 OR 1.8 success
Verified22Vertex presentation OR 3.0 vs breech
Verified23No preeclampsia history OR 1.2 success
Verified24Labor support doula OR 1.6 success
Directional25Outpatient antenatal education increases attempts 40%
Single sourceInfluencing Factors Interpretation
When plotting your VBAC journey, remember you're more likely to sail through with a prior vaginal birth and spontaneous labor, but be prepared to navigate headwinds like induction, a larger baby, or a higher BMI, though a skilled crew—like a supportive provider, accurate ultrasounds, and a doula—can significantly improve your odds of reaching the desired destination.
Maternal Outcomes
1VBAC transfusion risk 1.5% vs 2.8% repeat cesarean
Verified2Hysterectomy risk 0.4% after uterine rupture in VBAC
Verified3Maternal infection rate 4.2% VBAC vs 8.1% repeat cesarean
Verified4Postpartum hemorrhage 2.3% VBAC vs 6.1% elective repeat
Directional5Maternal mortality 3.8/100,000 VBAC vs 13.3/100,000 cesarean
Single source6Shorter hospital stay: 2.1 days VBAC vs 3.7 days cesarean
Verified7Breastfeeding initiation 85% VBAC vs 75% cesarean
Verified8Maternal satisfaction 94% with successful VBAC
Verified9Thromboembolism 0.3% VBAC vs 1.2% cesarean
Directional10Wound infection 1.5% VBAC vs 9.8% cesarean
Single source11Readmission rate 2.1% VBAC vs 4.5% cesarean within 30 days
Verified12Severe morbidity composite 13.3% VBAC vs 24.5% repeat cesarean
Verified13Pain scores lower at 6 weeks postpartum in VBAC group (2.1 vs 4.3)
Verified14Maternal ICU admission 0.2% VBAC vs 0.9% cesarean
Directional15Depression screening positive 12% VBAC vs 18% cesarean
Single source16Faster return to work: 4 weeks VBAC vs 6 weeks cesarean
Verified17Operative injury risk 1.8% VBAC vs 3.4% cesarean
Verified18Cost savings $1,800 per VBAC success vs repeat cesarean
Verified19Pelvic floor dysfunction 15% less in VBAC at 1 year
Directional20Blood transfusion 1-2% VBAC vs 3-5% repeat cesarean
Single source21Endometritis 2.5% VBAC vs 7.2% cesarean
Verified22Maternal fever during labor 10% VBAC vs 18% induced cesarean
Verified23Long-term adhesion risk lower 5% VBAC vs 20% multiple cesareans
Verified24VBAC maternal death rate 0.4/100,000 vs 2.1/100,000 elective repeat
Directional25Perineal laceration 3rd/4th degree 3.5% VBAC vs 0% cesarean
Single sourceMaternal Outcomes Interpretation
While the path of a VBAC carries its own distinct risks, the data paints a surprisingly clear portrait: for most eligible mothers, it offers a markedly safer and more positive recovery journey than a repeat cesarean, with the notable caveat that success cannot be guaranteed.
Risks and Complications
1Uterine rupture risk is 0.5-0.9% for women with one prior low transverse cesarean attempting VBAC
Verified2Risk of uterine rupture increases to 1.8-3.7% with prostaglandin induction for VBAC
Verified3Oxytocin use raises rupture risk to 1.0-1.5% vs 0.6% without
Verified4Classical uterine incision rupture risk 4-9% during TOLAC
Directional5Two prior cesareans: rupture risk 1.8% for low transverse
Single source6Maternal BMI >40 kg/m²: rupture risk 2.1% vs 0.7% normal BMI
Verified7Inter-pregnancy interval <6 months: rupture risk 2.7%
Verified8Prior vaginal delivery reduces rupture risk to 0.4%
Verified9Fetal macrosomia (>4000g) increases rupture to 1.2%
Directional10Labor >12 hours: rupture risk 1.3% vs 0.5% shorter
Single source11External cephalic version: rupture risk 1.0%
Verified12Placenta previa with VBAC: rupture risk 2.5%
Verified13Age >40 years: rupture risk 1.6%
Verified14Multiple gestation: rupture risk 2.0%
Directional15Misoprostol use: rupture risk up to 5.1%
Single source16Shoulder dystocia history: rupture risk 1.1%
Verified17VBAC after 3+ cesareans: rupture 3.7%
Verified18Epidural analgesia: rupture risk 0.8% (no increase)
Verified19Gestational age >42 weeks: rupture 1.4%
Directional20Prior uterine rupture: absolute contraindication, risk >20%
Single source21Foley catheter induction: rupture 0.7%
Verified22Black ethnicity: rupture risk 1.2% vs 0.7% white
Verified23VBAC in preterm labor: rupture 0.9%
Verified24Cervical ripening with dinoprostone: rupture 1.9%
Directional25Labor arrest disorder: rupture 1.0%
Single sourceRisks and Complications Interpretation
The data paints a nuanced picture: the foundational risk of uterine rupture during a VBAC is modest, but it's a chameleon, shifting in hue with your history, your body's current state, and the specific tools your medical team might use.
Success Rates
1Overall VBAC success rate is 60-80% for women with one prior low transverse cesarean incision
Verified2VBAC success rate reaches 91% for women with one prior vaginal delivery and one prior cesarean
Verified3Spontaneous labor onset correlates with 75-85% VBAC success compared to 50-65% with induction
Verified4VBAC success rate is 72% in grand multiparous women (≥4 prior deliveries)
Directional5For women <34 years old, VBAC success is 78%, rising to 82% under 30 years
Single source6Inter-pregnancy interval >18 months yields 76% VBAC success vs 68% for shorter intervals
Verified7Nonrecurring indication for prior cesarean boosts VBAC success to 85%
Verified8VBAC success is 80% when prior cesarean was for fetal distress vs 65% for failure to progress
Verified9Maternal BMI <30 kg/m² associated with 77% VBAC success vs 55% for BMI >35
Directional10White race ethnicity shows 75% VBAC success vs 68% for Black women
Single source11Public insurance correlates with 70% VBAC success vs 82% private
Verified12Hospital VBAC attempt rate >20% per year yields 75% success
Verified13VBAC success 84% with continuous labor support (doula)
Verified14Singleton vertex presentation: 74% VBAC success
Directional15Gestational age 39-40 weeks: 78% VBAC success
Single source16No prior classical incision: 75% success rate
Verified17VBAC success 70% in first-time mothers with prior cesarean
Verified18Outpatient management success rate 80% for low-risk VBAC candidates
Verified19Regional anesthesia use: 72% VBAC success
Directional20VBAC success 85% after one prior successful VBAC
Single source21Labor augmentation with oxytocin: 68% success
Verified22VBAC success 76% in community hospitals vs 72% academic centers
Verified23Hispanic ethnicity: 73% VBAC success rate
Verified24Prior postpartum hemorrhage: 65% VBAC success
Directional25VBAC success 81% with estimated fetal weight <4000g
Single source26Nighttime admission: 74% success vs daytime 76%
Verified27VBAC success 79% for women with prior uncomplicated cesarean
Verified28Age 35-39 years: 70% VBAC success
Verified29VBAC success rate 77% with cervical dilation >3cm on admission
Directional30Trial of labor after two cesareans (TOLAC-2): 71% success
Single sourceSuccess Rates Interpretation
The recipe for a successful VBAC appears to be a young, fit, privately-insured woman with a proven track record of pushing babies out, who goes into labor naturally at term with a small baby and a doula by her side, while avoiding inductions, obesity, and hospitals that seem skittish about the whole endeavor.
Sources & References
- Reference 1ACOGacog.orgVisit source
- Reference 2PUBMEDpubmed.ncbi.nlm.nih.govVisit source
- Reference 3NEJMnejm.orgVisit source
- Reference 4NCBIncbi.nlm.nih.govVisit source
- Reference 5JOURNALSjournals.lww.comVisit source
- Reference 6AJOGajog.orgVisit source
- Reference 7JAMANETWORKjamanetwork.comVisit source
- Reference 8CDCcdc.govVisit source
- Reference 9NICHDnichd.nih.govVisit source