Birth after a cesarean: planned VBAC or a repeat cesarean?

The next birth can usually be planned in one of two ways

A planned vaginal birth after cesarean (VBAC) means waiting for labour to start and aiming for a vaginal birth. Many women who plan a VBAC give birth vaginally; some need a cesarean during labour.

A planned repeat cesarean is an operation arranged for a set date, usually from 39 weeks of pregnancy unless there is a reason to deliver sooner. If labour starts earlier, the plan is reviewed.

NICE advises discussing the choice during pregnancy, with time to think. If your earlier cesarean was in another hospital or country, a copy of the operation notes helps: they record why it was done and the type of cut made in the womb.

What shapes the choice: your earlier births and this pregnancy

No single factor decides it. The details that usually carry most weight are:

• The reason for the earlier cesarean. A reason tied to that pregnancy, such as a breech baby, may not recur; if labour did not progress, this is discussed in more detail.
• How many cesareans you have had. After one, VBAC is often an option. After two or more it can still be considered, but it calls for a detailed discussion with a senior obstetrician.
• The type of cut in the womb. Most cesareans use a low, sideways cut. A vertical or T-shaped cut makes the scar more likely to open in labour, so a planned cesarean is usually advised. The skin scar does not always match the one on the womb.
• Any previous vaginal birth, which makes a vaginal birth this time more likely.
• This pregnancy: the baby’s position, where the placenta lies, whether there is more than one baby, your health, and the time since your last birth, as a short gap makes the scar more likely to open.

The benefits and risks of each option, side by side

When a planned VBAC ends in a vaginal birth, you avoid surgery and usually recover more easily. No new scar is added to the womb, which matters if you hope for more children: the chance of a low-lying placenta, or one that grows too deeply into the womb wall, rises with each cesarean.

The risk that matters most with a planned VBAC is uterine rupture, where the scar on the womb gives way during labour. It is uncommon, but when it happens it is an emergency for both mother and baby. A cesarean needed during labour carries more risk than a planned one, and the chance of needing a blood transfusion or of infection in the womb is slightly higher than with a planned repeat cesarean. As in any vaginal birth, forceps or ventouse may be needed, and tears can happen.

With a planned repeat cesarean there is no labour, so the scar is far less likely to open, and the date is set in advance. It is still major surgery, with risks of infection, heavier bleeding, blood clots and, uncommonly, injury to the bladder or bowel, and scar tissue can make each later operation harder. Recovery is usually slower, babies more often need help with breathing at birth, and the placenta risks above rise with each additional scar.

Why labour after a cesarean is advised in a hospital labour ward

If the scar begins to open, mother and baby can be affected quickly. NICE and RCOG therefore advise planning a VBAC in a hospital labour ward, where an emergency cesarean and a blood transfusion can be arranged at short notice.

Continuous monitoring of the baby’s heartbeat (CTG) is recommended throughout labour, because a change in the heart rate is often an early sign that the scar is under strain. Staff also watch for pain over the scar, bleeding and changes in your pulse and blood pressure. An epidural can be used for pain relief.

If labour has not started by the agreed time, the options are discussed again: waiting longer, induction or a planned cesarean. Induction, and a drip to strengthen contractions, put extra strain on the scar and make rupture more likely than labour that starts naturally, so the decision to induce is weighed carefully.

The decision is yours, and it can be revisited

Your obstetrician explains how these factors apply to you; the choice itself is yours. NICE guidance supports a woman’s decision either way once she has clear information. You can take your time, involve your family if you wish and ask for a second opinion.

A plan made in early pregnancy is not fixed. If the baby turns breech, the placenta is found to be low, a health problem develops or you feel differently, the plan is discussed again. It helps to have the agreed plan in your notes, including what to do if labour starts early.