How Much Sleep Does a Baby Need?

The figures, and who publishes them

The World Health Organization's guidelines on physical activity, sedentary behaviour and sleep for children under 5 give the most widely cited numbers. For infants under 1 year, the recommendation is to have 14 to 17 hours of good quality sleep at 0 to 3 months of age, or 12 to 16 hours at 4 to 11 months of age, including naps. For children aged 1 to 2 years the figure becomes 11 to 14 hours of good quality sleep including naps, with regular sleep and wake-up times.

Ireland's HSE gives a notably wider range for the newborn period, stating that your baby will need about 9 to 18 hours of sleep until age 3 months, and adding that babies aged 0 to 3 months will wake up regularly to be fed during the day and night, while babies aged 3 to 6 months may sleep for longer periods at night, though it is normal for them to wake during the night for feeds.

The American Academy of Pediatrics does not publish its own arithmetic. It endorses the American Academy of Sleep Medicine consensus figures and stresses that these are total sleep hours in a 24-hour period, so if your child still naps you need to take that into account when adding up their typical sleep hours.

Why the ranges differ

A range of 9 to 18 hours for a newborn is not sloppy drafting. It reflects how much genuine variation exists at this age. The WHO figure of 14 to 17 hours describes the middle of the distribution; the HSE figure describes its edges. Neither is telling you your baby is wrong.

What both are telling you is that the number is a 24-hour total, not a night-time figure, and that naps count. Parents who add only night sleep almost always conclude their baby is badly short of sleep when they are not.

What the number cannot tell you

Total hours say nothing about how the sleep is distributed, which for the first months is the part that determines how survivable it feels. NHS guidance describes newborn sleep patterns as irregular by nature, with babies waking frequently through the night to feed, and notes that a settled pattern develops gradually over the first year rather than arriving on a date.

Night waking to feed is not a deviation from the guideline. It is how the hours are distributed at this age. A baby sleeping 15 hours in total across five separate stretches is within the WHO range.

How to work out your baby's total

Pick an ordinary week rather than one disrupted by illness, travel or vaccinations. Record when your baby actually falls asleep and wakes, both at night and for every nap, and add the totals for each 24-hour period. Take the average over the week rather than judging a single day, because day-to-day variation at this age is large.

Count from falling asleep, not from being put down. In older babies the gap between the two can be substantial and is the commonest reason a total comes out lower than expected.

Judging whether it is enough

The behavioural signs matter more than the arithmetic. A baby getting enough sleep generally wakes reasonably content, feeds well, has periods of alert engagement during the day, and is not persistently difficult to settle. A baby who is short of sleep tends to be harder to settle rather than easier, because overtiredness in infancy usually shows as agitation rather than drowsiness.

The AAP notes that children who get enough sleep tend to do better on behaviour, memory and mood, and that regular sleep deprivation is associated with irritability and difficulty concentrating. Those signs are more useful than a stopwatch.

When the total is genuinely low

If your baby is consistently well below the range for their age and is also unsettled, feeding poorly or not gaining weight as expected, speak to your health visitor, public health nurse or GP. Persistent very short sleep alongside poor feeding is a reason to be seen rather than a scheduling problem to solve.

What actually influences the total

NHS guidance on helping your baby to sleep gives the practical levers. Keep the difference between day and night clear: keep things bright, sociable and normal during daytime feeds, and quiet, dim and low-key at night. Establish a simple, repeatable bedtime routine, which might be a bath, a change into night clothes, a feed and a story or song, done in the same order each evening.

It also suggests beginning to put your baby down when they are sleepy but not fully asleep, so that they gradually learn to fall asleep in their cot rather than only in arms. The AAP describes the same principle in its guidance on getting your baby to sleep.

Feeding and sleep are linked in the first months. A baby who is not feeding effectively will wake more often, so if night waking is unusually frequent and feeds seem unsatisfying, an infant feeding review is often more productive than a sleep intervention.

Where the sleep happens matters more than how much

Whatever the total, safer sleep guidance applies to every one of those hours. The Lullaby Trust advises that babies should sleep on their back for every sleep, day and night, on a firm, flat mattress with no loose bedding, pillows or bumpers, in your room for at least the first six months. The AAP and Red Nose Australia give equivalent advice.

Naps in bouncers, swings, car seats, pods and nests are not safe sleep spaces, so a nap in one of those counts towards the total but should not be a routine sleep location.

When to ask for help

Speak to your health visitor, public health nurse or GP if your baby's sleep is consistently far outside the ranges for their age and they seem unwell or unsettled with it, if they are difficult to rouse or unusually sleepy, if they snore loudly or seem to pause in their breathing during sleep, if feeding and weight gain are affected, or if the lack of sleep is affecting your own health. Sleep deprivation in parents is itself a reason to ask for support, and health visitors expect that conversation.