Two decisions, not one

Almost all of the confusion here comes from collapsing two separate choices into one word.

Labouring in water means using a bath or birth pool for pain relief during labour, and getting out to give birth. NICE recommends that services "offer the woman the opportunity to labour in water for pain relief."

Birth in water means the baby is born while you are still immersed. That is a separate recommendation with separate evidence — and it is the one the UK and the US disagree about.

ACOG makes the same distinction and explains why it matters: "commonly, immersion is referred to as 'water birth', but effects and outcomes may be different for immersion during the first stage of labour and the second stage, including delivery." Its committee opinion deliberately avoids the term "water birth" for this reason.

What the UK guidance says

NICE updated this in 2025 and the recommendation is now: "consider birth in water for women and pregnant people." It then sets out what women should be told the evidence shows, comparing giving birth in water with out of water. Water birth may be associated with:

"a lower risk of severe perineal trauma (third or fourth degree tearing) for multiparous women and pregnant people"
"a lower risk of postpartum haemorrhage"
"an increase in risk of snapping of the cord before cord clamping"
"a lower risk of admission to the neonatal unit"

And on the outcome everyone actually wants settled, NICE does not pretend: the evidence "was inconclusive on risk of the baby dying (during or after birth), so it is not possible to say whether there is any difference between the 2 options."

That is an unusually honest set of bullet points, and the third one — cord snapping — is a real risk that rarely appears in enthusiastic descriptions of water birth.

What the US guidance says

ACOG reaches a different conclusion on the same body of evidence, and states it plainly: "there are insufficient data on which to draw conclusions regarding the relative benefits and risks of immersion in water during the second stage of labor and delivery. Therefore, until such data are available, it is the recommendation of the American College of Obstetricians and Gynecologists that birth occur on land, not in water."

It does not, however, close the conversation. "A woman who requests to give birth while submerged in water should be informed that the maternal and perinatal benefits and risks of this choice have not been studied sufficiently to either support or discourage her request."

On the first stage ACOG is positive: "immersion in water during the first stage of labor may be associated with shorter labor and decreased use of spinal and epidural analgesia and may be offered to healthy women with uncomplicated pregnancies between 37 0/7 weeks and 41 6/7 weeks of gestation."

ACOG also notes, fairly, that other professional bodies take a different view — it names the Royal College of Obstetricians and Gynaecologists and the American College of Nurse–Midwives as supporting healthy women with uncomplicated pregnancies labouring and giving birth in water. And it records how differently the practice is distributed: in the UK, immersion rates range "from 1.5% of hospital deliveries to 58% of births in a freestanding midwifery unit."

Reading the disagreement fairly

Both bodies agree on the first stage. Both agree the second-stage evidence is weak. They differ in what to do about weak evidence: NICE says consider it and here is what the signals point to; ACOG says default to land until better data exists. Neither is claiming the other is reckless, and neither claims water birth has been shown to be dangerous.

What that means practically is that where you are giving birth determines what will be offered without you having to push for it, and the reasoning behind each position is available to you.

The conditions that apply either way

Water temperature. NICE: "the temperature of the water should not be above 37.5°C." The NHS repeats the figure and notes your own temperature will be monitored.
Hourly checks. NICE requires the temperature of both the woman and the water to be monitored hourly.
Cleaning. NICE requires baths and birthing pools to be cleaned under a protocol agreed with local microbiology or infection control, and in line with the pool manufacturer's guidelines. ACOG makes the same point in stronger terms, requiring facilities to establish "rigorous protocols for candidate selection; maintenance and cleaning of tubs and pools; infection control procedures... monitoring of women and fetuses at appropriate intervals while immersed; and moving women from tubs if urgent maternal or fetal concerns or complications develop."
Opioids. NICE: "women should not enter water (a birthing pool or bath) within 2 hours of opioid administration or if they feel drowsy."
Mobility. NICE, 2025: support women with mobility issues to access water "by doing an individualised needs assessment, and making reasonable adjustments for them based on this."

Availability, which is the real constraint

The Obstetric Anaesthetists' Association gives the honest version: "many maternity units have birthing pools, but these may not be available when you need them. Check with your midwife if there is a pool at your birth unit or hospital. Ask whether it is safe for you and your baby to use it."

A pool is a single physical object shared by everyone in labour on that unit at that moment. Ask how many your unit has, not whether it has one — and ask the same question of any midwifery unit or birth centre you are considering.

At home, a pool is something you arrange. The NHS lists "how do I get a birthing pool?" among the questions to ask when planning a home birth, and notes that a birth pool is one of the options that remains open at home when an epidural is not.

What can close the pool

Being induced is the most common reason. NICE's induction guidance requires women to be told "there may be limitations on the use of a birthing pool" — because induction often brings continuous fetal monitoring and an oxytocin drip with it.

An opioid injection closes it for two hours. And an epidural closes it entirely, since NICE requires intravenous access and continuous monitoring when regional analgesia is established.

Water Birth