Quick answer: VBAC — vaginal birth after caesarean — is a legitimate, evidence-supported birth option for the majority of women with a previous caesarean section.
VBAC — vaginal birth after caesarean — is a legitimate, evidence-supported birth option for the majority of women with a previous caesarean section. It’s also one of the most misunderstood areas of obstetrics, surrounded by conflicting advice, institutional variation, and decisions that deserve more information than most women receive.
Who Is a Good Candidate for VBAC
VBAC is appropriate for most women with one previous lower segment caesarean (the horizontal incision made in the lower part of the uterus). The RCOG (Royal College of Obstetricians and Gynaecologists) and ACOG (American College of Obstetricians and Gynecologists) both support VBAC as a reasonable option for appropriately selected women in facilities with emergency caesarean capability. VBAC is generally NOT recommended for: more than two previous caesarean sections (risk increases substantially); previous uterine rupture; previous classical (vertical) uterine incision; certain uterine abnormalities; and situations where the reason for the previous caesarean was a fixed one (very small pelvis, certain maternal conditions). In most other cases — including previous caesarean for failure to progress, fetal distress, or malpresentation — the underlying reason does not recur in subsequent pregnancies, and VBAC success rates are good.
The Actual Statistics on VBAC Success and Risk
VBAC success rate: approximately 72–75% of women who attempt VBAC achieve a vaginal birth. The most reliable predictors of VBAC success: previous vaginal birth (whether before or after the caesarean) increases success rate to approximately 90%; spontaneous (uninduced) labour; and cervical dilation at admission. The primary risk of VBAC is uterine rupture — tearing at the caesarean scar. The risk is approximately 0.5–0.9% (5–9 per 1,000 VBAC attempts). This is the number that generates fear and is worth contextualising: the absolute risk is low; the majority of ruptures are detected and managed without catastrophic outcomes (full catastrophic rupture is rarer still, at approximately 1–4 per 10,000); and the risk of emergency hysterectomy, bladder injury, and severe haemorrhage is higher in planned repeat caesarean than in successful VBAC. The risk comparison is not VBAC vs. no risk — it’s VBAC risk vs. repeat caesarean risk.
What a VBAC Birth Requires
VBAC should take place in a facility with: immediate access to emergency caesarean (within 30 minutes is the standard); continuous fetal monitoring (CTG) throughout labour, because the first sign of uterine rupture is usually an abnormal fetal heart trace; IV access throughout labour; an anaesthetist available; and a consultant obstetrician on the team. This means VBAC is not appropriate in a home birth setting or in a birth centre without immediate surgical backup. The continuous CTG requirement means less mobility than many women want in labour — a significant practical consideration to discuss with your midwife about working within.
Induction and VBAC
Induction of labour in a VBAC setting is more complex than in an unscarred uterus. Prostaglandins (cervical ripening agents) are associated with a 2–3x increase in uterine rupture risk in women with a previous caesarean and are generally not recommended. Oxytocin induction can be used carefully and with close monitoring. The Foley balloon catheter for cervical ripening does not increase rupture risk and is preferred where mechanical ripening is needed. If your cervix is unfavourable at 40–41 weeks and induction is being discussed for a VBAC, the specific method matters enormously.
Frequently Asked Questions
How long should I wait after a caesarean before getting pregnant?
Most guidelines recommend waiting at least 18 months between caesarean delivery and next conception (approximately 12 months between caesarean and subsequent birth), based on data showing lower uterine rupture risk in VBAC when the interpregnancy interval is longer. Short interpregnancy intervals are associated with higher rupture risk.
If I attempt VBAC and need an emergency caesarean, is that worse than a planned caesarean?
Emergency caesarean carries higher complication risk than planned caesarean — this is a genuine consideration. However, the approximately 72–75% of women who succeed in VBAC have faster recovery, lower transfusion rates, and lower long-term complication rates than those who have a repeat caesarean. The overall outcomes — when you include both the women who succeed and those who need emergency caesarean — are broadly comparable to planned repeat caesarean, with some advantages of VBAC in women who are likely to have more children (each caesarean increases placenta accreta risk in subsequent pregnancies).
My hospital says they don’t ‘support’ VBAC — what are my options?
You have the right to make an informed decision about your birth regardless of what your local hospital ‘supports.’ If your hospital has a blanket policy against VBAC, you can: request a formal risk assessment with a consultant obstetrician; ask to be referred to a hospital with VBAC capability; seek a second opinion; and invoke your rights under the NHS Constitution (UK) or patient autonomy principles. VBAC is not an experimental option — it is a guideline-supported birth choice.
Related Reading
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- Birth trauma: when your birth story still haunts you
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