Twin Birth: Vaginal or Caesarean

The four conditions

NICE gives a single, quotable answer to the question everyone asks. It says to explain to women with an uncomplicated twin pregnancy that "planned vaginal birth and planned caesarean section are both safe choices for them and their babies" if all four of the following apply:

• the pregnancy remains uncomplicated and has progressed beyond 32 weeks
• there are no obstetric contraindications to labour
• the first baby is in a cephalic (head-first) presentation
• there is no significant size discordance between the twins

Twins Trust describes the same picture from the parent's side: a vaginal birth is usually considered when the pregnancy has been straightforward, you are over 32 weeks, your health is stable and the babies are ideally head down, similar in size and not lying breech or sideways.

The NHS adds a note people often do not expect: "Lots of women think they have to have a caesarean section with twins, but in fact, many twin births are vaginal."

What actually happens to birth plans

NICE asks teams to be specific about this, and the numbers are worth having in advance. For women giving birth after 32 weeks, it says to explain that:

• more than a third of women who plan a vaginal birth go on to have a caesarean section
• almost all women who plan a caesarean section do have one, though a few give birth vaginally before the caesarean can be carried out
• a small number of women who plan a vaginal birth need an emergency caesarean to deliver the second twin after vaginal birth of the first

Twins Trust puts a figure on that last scenario, saying it happens in fewer than 5% of twin births. It also says caesarean is the most common way for twins, triplets or more to be born in the UK, with over half of twin pregnancies and almost all triplet and quadruplet pregnancies delivered that way.

When caesarean is recommended rather than offered as a choice

NICE names the situations directly.

• Offer caesarean section if the first twin is not cephalic at the time of planned birth.
• Offer caesarean section in established preterm labour between 26 and 32 weeks if the first twin is not cephalic.
• Offer an individualised assessment of mode of birth in suspected, diagnosed or established preterm labour before 26 weeks, taking into account the risks of caesarean and the chance of survival of the babies.
• Offer caesarean for a monochorionic monoamniotic twin pregnancy at the time of planned birth, which NICE sets between 32 weeks and 0 days and 33 weeks and 6 days, or earlier if a complication requires it.
• Offer caesarean for a triplet pregnancy at the time of planned birth, which NICE sets at 35 weeks, or earlier if a complication requires it.

The NHS lists the practical reasons a caesarean may be planned or recommended: the first baby lying feet, knees or buttocks first, one twin lying sideways, a low-lying placenta, twins sharing a placenta, or a difficult previous delivery. It also says triplets or more are almost always delivered by planned caesarean, and that if you have had a caesarean before, a vaginal twin birth is not usually recommended.

What labour with twins looks like

The NHS says the process of labour is more or less the same as for one baby, with some additions. You will normally be advised to give birth in hospital. There are usually more health professionals present — the NHS gives an example of two midwives, an obstetrician and two paediatricians, one for each baby. Twins Trust adds an anaesthetist to that list and notes you can ask students to leave if you would rather they were not there.

Monitoring is continuous. NICE says to offer continuous cardiotocography to women with a twin pregnancy in established labour who are more than 26 weeks pregnant, and explicitly says not to offer intermittent auscultation in that group. It asks for dual channel monitors so both hearts are recorded at once, for the maternal pulse to be displayed on the same trace, and for a portable ultrasound scan when established labour starts to confirm which twin is which and where the hearts are. NICE even warns teams to check that they are not accidentally monitoring the same baby twice.

The NHS describes the belts and sensors, one per twin, and says you will still be able to move around. It also mentions that once your waters have broken your midwife may ask to attach a clip to the first baby's head for a more accurate heartbeat reading — NICE says a fetal scalp electrode should only be used after 34 weeks and if there are no contraindications.

Pain relief

NICE says to offer an epidural to women with a twin or triplet pregnancy who choose a vaginal birth, explaining that it is likely to improve the chance and timing of an assisted birth of all the babies and to enable a quicker emergency caesarean if one is needed. Regional anaesthesia is offered for caesarean birth. NICE asks for this discussion to happen by 28 weeks at the latest.

The NHS makes the same recommendation in plainer language, noting that if there are any problems it is easier for the team to deliver quickly if an epidural is already in place. Twins Trust says the usual options — gas and air, pethidine, epidural or spinal — are all available.

Between the first and second baby

The NHS says that once the first baby is born, the team check the second baby's position by feeling your tummy, doing a vaginal examination and sometimes an ultrasound scan. If the second baby is well positioned it should be born soon after the first, because the cervix is already fully dilated. Twins Trust says the second baby is usually born within about thirty minutes, although this varies. If contractions stop, the NHS says hormones may be offered through a drip to restart them.

NICE covers what happens if the second baby's trace becomes concerning, saying that if vaginal birth cannot be achieved within 20 minutes, a caesarean should be discussed.

The third stage, and why it is managed

NICE is unusually firm here. It says do not offer physiological management of the third stage to women with a twin or triplet pregnancy, and instead offer active management, explaining that it is associated with a lower risk of postpartum haemorrhage and blood transfusion. It asks teams to assess the risk of haemorrhage from the antenatal period onwards, to ensure intravenous access at the start of established labour, and to take blood for a full blood count and group and save.

Twins Trust describes the injection — Syntocinon or Syntometrine — given to help the uterus contract and reduce blood loss. Tommy's notes you may be more likely to bleed more heavily after birth than someone giving birth to one baby, and may be offered medicine to reduce that chance.

Planning around a plan that may change

Given how often twin birth plans move, the most useful preparation is to have preferences for both routes. Twins Trust suggests discussing caesarean preferences — skin-to-skin in theatre, who is with you, music — even if you are hoping for a vaginal birth, so that a change of plan does not mean losing every choice at once.