How often, in numbers

The NHS's answer is behavioural rather than timed. Babies need frequent nappy changes, changing a wet or dirty nappy promptly helps prevent nappy rash, and the NHS gives one figure: "Young babies may need changing as many as 10 or 12 times a day, while older babies need to be changed around 6 to 8 times."

Two numbers give you the floor rather than the ceiling. The AAP says a newborn may urinate as often as every one to three hours, or as infrequently as four to six times a day, and sets a practical benchmark of at least four wet nappies a day. The HSE's account of dirty nappies is deliberately wide: some babies have a dirty nappy after every feed, others only once a day or every few days, and a baby is not constipated if the poo is soft even after a day or two without one.

So the honest answer to "how many is normal" is that the count varies enormously and the useful thing to track is whether it is falling, not what it is.

Do you wake a sleeping newborn to change them?

No national health service publishes an instruction to wake a sleeping baby for a wet nappy, and neither the NHS nor the HSE mentions it in their nappy changing guidance. What both do say is that changing a wet or dirty nappy promptly helps prevent nappy rash — which is an argument about how long a nappy stays on, not about waking anyone.

In practice most parents work around feeds, changing at the start of a feed or between sides. That uses a waking your baby was going to do anyway, and it has a side benefit: a nappy change is stimulating, so it can rouse a drowsy newborn enough to feed properly. That is a practical habit rather than a published rule.

Do change straight away, sleeping or not, if:

Your baby has done a poo. Stool on the skin is the main cause of nappy rash, so it should not sit.
Your baby already has nappy rash or sore skin.
The nappy is soaked through to their clothes.
Your baby is unsettled and you have run out of other explanations.

The night version

Night changes are unavoidable in the first weeks, because newborns feed round the clock and most poo during or after feeds. What you can do is make them uneventful:

Keep everything within reach of where you feed, so you are not walking to another room.
Low light, no talking. The HSE's newborn sleep advice is to keep the room dark and quiet and to limit distractions such as music, lights and screens.
Change before the feed rather than after when you can, so your baby can fall asleep at the end of the feed rather than being woken up again.
Skip the wipe-down. A wet-only nappy at 3am needs a change, not a full clean-up.

Wet nappies gradually stop needing a night change as your baby gets older. Poo-filled ones never do.

How to change one

The NHS's and HSE's instructions overlap almost completely:

Wash your hands before and after — the HSE lists this first.
Get everything ready first: clean nappy, cotton wool or wipes, a bowl of warm water, a changing mat, a bag for the used nappy, and clean clothes if needed.
Change on a low surface. The NHS advises changing your baby on a changing mat on the floor, especially if you have more than one baby, so they cannot fall.
Never leave your baby unattended on a raised surface, even for a second, and even before they can roll.
Clean girls from front to back, to avoid getting germs into the vagina, and do not clean inside the labia.
Do not pull back a baby boy's foreskin. Clean around it only.
Use cotton wool and water at first. The HSE suggests avoiding baby wipes until your baby is around two to four weeks old.
Dry gently, including in the skin creases, before the clean nappy goes on.
Nappy-off time. Both services recommend leaving your baby without a nappy for a while each day. The HSE calls it messy but great for their skin.

On supplies, the NHS's list of what you will need is short: sheets that can be changed often, several changes of clothing, and nothing elaborate. Its one firm instruction on baby clothing is about layers rather than warmth — several light layers are better than one heavy one, and mittens and bootees for going out should be close-knitted rather than loosely knitted so that fingers and toes cannot get caught.

What is worth looking at while you are there

A nappy change is the most reliable diagnostic moment in a newborn's day, and it is worth two seconds of attention:

Colour of the poo. The HSE's trigger for contacting your GP or public health nurse is a change — very smelly, pale, watery, harder, or containing blood.
The first poo. NICE's postnatal care guideline NG194 states that if a baby has not passed meconium within 24 hours of birth, this may indicate a serious disorder and requires medical advice.
Wet nappy count. Reduced urine output is an intermediate-risk amber sign in NICE's fever guideline, and a falling count in a newborn is a feeding question worth raising early.
The skin. Redness in the creases, spreading rash, or broken skin.
The cord stump, until it comes away: redness spreading onto the tummy, a bad smell, or pain when touched.

Blood or pink stains in the first week

Two things appear in newborn nappies in the first days and both have hormonal or harmless explanations. Baby girls may have a white discharge and a little blood in the first days after birth, caused by hormones crossing the placenta. And a pink or brick-red stain is usually concentrated urine rather than blood — the AAP's rule is that as long as your baby is wetting at least four nappies a day there is probably no cause for concern, and that persistent pink staining should be checked. The AAP is firm about the boundary: after the first week, actual blood in the urine or on the nappy is never normal and should be reported.

When to call

Call your local emergency number (999 in the UK and Ireland, 911 in the US and Canada, 000 in Australia, 111 in New Zealand) if your baby: has a temperature of 38C (100.4F) or above or below 36C (96.8F); looks pale, ashen, mottled or blue; is unresponsive or unrousable; has a weak, abnormally high-pitched or continuous cry; is grunting, breathing over 60 breaths a minute or drawing their chest in; has a bulging fontanelle, neck stiffness or a seizure; has a rash that does not fade under a pressed glass; is vomiting green or yellow-green; or has diarrhoea with signs of dehydration. Those are NICE's red flags for serious illness in young babies.

Contact your midwife, health visitor, public health nurse or GP if: wet nappies have dropped off; there is blood in the nappy after the first week; the poo is pale, chalky or white; your baby has not passed meconium within 24 hours of birth; nappy rash is not improving after a few days of treatment, is blistering, or has spreading redness.

What to let go of

There is no schedule to keep, no interval to hit, and no benefit to waking a sleeping newborn for a wet nappy. Change poo immediately, change wet nappies at feeds and when they are properly wet, and give the skin some air each day. The count matters only as information about feeding — and the person best placed to interpret a falling count is your midwife or health visitor, not the internet at 3am.

How Often to Change a Newborn Nappy