Giving Birth to Twins: Vaginal, C-Section, Twin B

Many twins can be born vaginally. Whether that is offered to you depends mostly on the first twin, the one closest to the cervix (Twin A). If Twin A is head-down and the pregnancy is otherwise straightforward, guidelines treat a planned vaginal birth and a planned C-section as reasonable choices. If Twin A is breech or lying sideways, or the twins share one sac, a C-section is the usual recommendation. Expect more people in the room than at a singleton birth, often in an operating room. This page explains what parents are told. Your OB or maternal-fetal medicine team makes the plan.

What decides vaginal birth or C-section

ACOG’s multiple pregnancy FAQ says the chance of a C-section is higher with multiples, but “in some cases, twins can be delivered by vaginal birth.” It names what the decision depends on:

the number of babies, and the position, weight and health of each one
your health and how your labour is going
the experience of your ob-gyn

The UK’s NICE guideline on twin and triplet pregnancy is more specific. For an uncomplicated twin pregnancy it says planned vaginal birth and planned C-section “are both safe choices” when all of these apply: the pregnancy has gone beyond 32 weeks, there is no medical reason against labour, the first baby is head-first, and there is no significant size difference between the twins.

So the first question to ask is how Twin A is lying. The Harvard-affiliated CRICO twin management guideline, which cites ACOG, says a C-section “is indicated for twin pregnancies with a non-vertex presenting twin unless vaginal delivery is imminent.” Non-vertex means not head-down. Twin B’s position matters less at the start, for reasons covered below.

The NHS page on giving birth to twins lists the usual reasons a planned C-section is recommended or chosen:

the first baby is breech (feet, knees or bottom first)
one twin is lying sideways
you have a low-lying placenta
your twins share a placenta
you have had a difficult delivery before

It adds that after a previous C-section, a vaginal twin birth is “not usually recommended.” Twins who share a single sac (mono-mono) are a separate case. ACOG says those pregnancies are “likely to have a cesarean birth,” and NICE recommends offering one at the planned birth date.

A plan is not a promise

NICE asks clinicians to tell parents three things, and they are worth hearing before the day:

“more than a third of women who plan a vaginal birth go on to have a caesarean section”
almost everyone who plans a C-section has one, though a few give birth vaginally before it can happen
“a small number” who plan a vaginal birth need an emergency C-section for the second twin after the first is born vaginally

That last case, one twin born each way, is rare but real. The NHS mentions it too. Pack and plan as if either route is possible, because the twin hospital bag has to cover a C-section recovery even if you plan a vaginal birth.

What the room looks like

A twin birth is busier than a singleton one. The NHS says there may be “2 midwives, an obstetrician and 2 paediatricians (1 for each baby).” In the US the roles have different names, but the pattern is the same: a team for you and a team for each baby.

What usually happens during labour:

Monitoring of both babies the whole time. The NHS describes two belts with sensors, one for each twin, and says you can still change position. NICE recommends continuous monitoring for twins in established labour after 26 weeks, and an ultrasound when labour starts “to confirm which twin is which” and how each is lying.
An IV drip, offered in case it is needed later, for example to restart contractions after the first baby.
An epidural is usually recommended for a planned vaginal birth. NICE says it improves the chance of a well-timed assisted birth for both babies and lets the team do an emergency C-section faster if one is needed. It is still your choice. The CRICO guideline says pain relief “remains the patient’s choice.”
Often, an operating room for the birth itself. Practice varies by hospital. One example is Baylor College of Medicine’s twin vaginal delivery checklist: it moves the patient to the operating room at full dilation, set up for both a vaginal birth and a C-section, with an ultrasound switched on and the newborn team present. That is not a sign anything is wrong. It means the team can change course in minutes.

Ask your hospital where twins are usually delivered and who will be there. Partners in particular find it easier when they know beforehand that the room will be full.

Between the first birth and the second

This is the part that feels most unfamiliar. After Twin A is born:

Twin B’s position is checked. The NHS says this is done by feeling your bump, an internal exam, and sometimes an ultrasound.
If Twin B is in a good position, the NHS says they “should be born soon after the first,” because the cervix is already fully open.
If contractions stop, the team may offer a hormone drip to restart them.
If Twin B is breech, the CRICO guideline lists several acceptable approaches, including delivering the baby bottom-first, trying to turn the baby, or a C-section. It says an obstetrician skilled in these should be available.

How long the gap lasts varies. The CRICO guideline says that when monitoring is reassuring there is “no urgency” to deliver the second twin, but that with a shared placenta the team pays closer attention to the gap. Ask your OB what they would expect for your twins.

Questions to take to your OB

How is Twin A lying now, and when will you check again?
Under what circumstances would you support a vaginal twin birth here?
Do you deliver twins in the operating room, and who will be there?
What would happen if Twin B turns breech after Twin A is born?
If I have a C-section, can both babies come to me if they are well?
What level of NICU does this hospital have?

The twin pregnancy week-by-week guide suggests raising delivery from about 34 weeks, and when twins are usually born covers the timing by chorionicity. If either baby may need special care, read one twin home, one in the NICU before the birth rather than after.

FAQ: giving birth to twins

Can you have a natural birth with twins?

Often, yes. The NHS says “many twin births are vaginal.” It is most likely to be offered when the first twin is head-down, the pregnancy is uncomplicated and past 32 weeks, and the twins are similar in size. Your OB will tell you whether it is an option for you.

Does Twin B have to be head-down for a vaginal birth?

No. The decision mainly rests on Twin A. If Twin B is breech after Twin A is born, the team can deliver the baby bottom-first, try to turn the baby, or do a C-section. Ask whether your OB is experienced with these.

How long between twin births?

There is no fixed time. The NHS says a second twin in a good position is usually born soon after the first. If monitoring is reassuring, guidelines say there is no rush, though the team watches the gap more closely when twins share a placenta.