Night Waking by Age

The numbers nobody quotes

The most useful figures on baby night waking come from The Lullaby Trust's own parent surveys, and they are not the ones that circulate. Almost two thirds of parents with babies under a year old — 59% — say their baby sleeps for less than four hours at a stretch. Almost half, 44%, think their baby should be sleeping longer than they do. And on the question everyone actually wants answered: "Around a third of babies will have never slept all night by 12 months."

Put those together and the picture changes. The majority experience is broken sleep, and a large minority of parents are measuring their baby against a standard that most babies do not meet.

What each age band looks like

Newborn to 3 months

The NHS says newborns may sleep anywhere from around 8 to around 18 hours a day, and that "either is perfectly normal". Sleep comes in short or long bursts and it is, in the NHS's words, "highly unlikely they'll sleep through the night because they have tiny tummies and need to be fed." The HSE gives 9 to 18 hours, averaging about 14, with 1 to 3 hours between feeds. The Lullaby Trust's version is 8 to 18 hours a day but only two to three hours at a time.

3 to 6 months

Both the NHS and the Lullaby Trust use the same careful phrasing here: some babies may sleep for eight hours or longer at night, "but not all will". The HSE gives a total of 12 to 14 hours across day and night, and notes that "it is normal for them to wake for a short time during the night", with breastfed babies often sleeping for short periods between feeds.

6 to 12 months

The NHS says a baby around six months "may sleep for up to 12 hours at night", and immediately qualifies it: teething pain and hunger can disturb that. The HSE breaks it down further — about 10 to 11 hours at night by six months, and 10 to 12 hours by nine months and by a year. The Lullaby Trust adds the caveat that factors like teething, illness or hunger "may mean they wake more often again", which is why the second half of the first year often feels like going backwards.

After 12 months

The NHS says most babies will sleep around 12 to 15 hours in total after their first birthday. The WHO's 24-hour guidelines for under-fives give 14 to 17 hours of good quality sleep including naps for 0 to 3 months, 12 to 16 hours for 4 to 11 months, and 11 to 14 hours for 1 to 2 year olds. Those are 24-hour totals, not night-time figures, so naps count towards them.

Why babies surface so often

The mechanism is in the sleep architecture, and the Lullaby Trust describes it clearly. An adult sleep cycle runs about 90 minutes and starts with quiet, deeper sleep, which makes up roughly 75 to 80% of the cycle. A baby's cycle is about an hour long and runs the other way round: they fall first into active sleep, where they wake more easily, for about 20 minutes, and only then move into quiet sleep. As the Lullaby Trust points out, that means it is unlikely your baby is sleeping deeply at the same time you are.

The ability to wake — what researchers call arousal — is not a defect. It is a survival response: it is what lets a baby wake and move their head if their face becomes covered. Studies have found that some infants who died of SIDS had fewer spontaneous arousals and more immature sleep patterns than other babies, and that known SIDS risk factors impair a baby's ability to rouse.

Which is why sleeping longer is not automatically better

This is the part that commercial sleep advice tends to leave out. The Lullaby Trust warns that "encouraging babies to sleep for longer and more deeply than is usual for their stage of development may affect their ability to wake up if something is wrong, such as if their mouth and nose become covered." It names this as a SIDS risk and says plainly that products and well-meant tips promising deeper sleep "can actually be dangerous".

None of that means you have to accept every waking as unchangeable. It means the goal is a baby who settles more easily, not a baby who is harder to wake.

What to do at 3am

The HSE's advice is short. Try not to leave your baby crying for longer than a few minutes. Hold them and soothe them by talking softly, because talking loudly may encourage them to stay awake. Feed them if they are hungry. Use a dim night light and avoid blue light and bright screens. Do not change their nappy unless it is dirty or very wet. Put them back into the cot drowsy but awake, so they wake up where they fell asleep. And always back to sleep, on their back.

The HSE also notes that from around six to twelve months, rocking or back-rubbing can become sleep associations, and that these can be phased out gradually from six months if you want to.

When it is not just normal waking

Speak to your health visitor, public health nurse or GP if your baby's waking has changed suddenly and stayed changed, if they seem in pain when they wake, if they are feeding much less than usual, if they are not gaining weight, or if you are worried about them for any reason. The NHS says to speak to your health visitor if your baby is having problems sleeping. The Lullaby Trust adds the other reason to ask: if you are so tired that you cannot stay awake safely, that is worth help in its own right.