Almost everyone arrives at this question the same way: you've read that newborns sleep sixteen hours a day, you are quite sure yours has not, and you'd like to know which of you is wrong.
Probably neither. The honest answer is that the normal range here is enormous, and the total number of hours turns out to be one of the least useful things to measure.
The quick answer
Anywhere from about 8 to 18 hours in 24 is normal for a newborn, with most sitting somewhere around 14 to 17. It arrives in short blocks spread right across the day and night, rarely more than two to three hours at a time. Both a baby at the top of that range and one at the bottom can be perfectly healthy.
How much sleep, by age
- 0–4 months: roughly 8–18 hours per 24, typically around 14–17
- 4–12 months: roughly 12–16 hours per 24, including naps
- 1–2 years: roughly 11–14 hours per 24, including naps
Treat these as ranges, not targets. If your baby is feeding well, gaining weight, alert when awake and content most of the time, their sleep is almost certainly fine — even if your tally doesn't match the chart.
The total isn't the interesting part. The shape is.
A newborn isn't a small adult who sleeps a lot. They're born without a body clock, so they have no concept of night, and their stomachs are small enough that hunger overrides everything every couple of hours. The result is sleep scattered evenly around the clock.
What changes over the first six months isn't really the amount — that falls fairly slowly. It's the grouping.
A day's sleep, spread across 24 hours
Newborn about 16 hrs
3 months about 14 hrs
6 months about 13 hrs
Asleep
Illustrative, not a target. Three hours of sleep disappear between newborn and six months — but the night pulls itself together into one long block.
This is why the hours you've read about feel like a lie. Sixteen hours of sleep delivered in eight separate pieces, four of them between midnight and 6am, does not feel like a baby who sleeps a lot. It feels like a baby who never sleeps. Both things are true at once.
How long can a newborn stay awake?
Not long. In the first weeks, most newborns manage somewhere between 45 minutes and two hours awake before they need to sleep again — and that window includes the feed and the nappy change, not just the nice alert bit afterwards.
If your baby has been up for much more than an hour and is getting harder to settle, overtiredness is a likely culprit. It's counterintuitive, but an overtired baby is harder to get down, not easier. Keeping a newborn awake during the day does not buy you a better night.
What does help, gently, is making days and nights feel different: bright and chatty and noisy in the day, dim and quiet and boring at night. That's how the body clock starts to form. It takes a few months, and there's no way to rush it.
When do babies actually sleep through the night?
Later than you've been led to believe, and not in a straight line.
- Around 3 months: some babies drop a night feed and manage a stretch of about five hours. Many don't.
- Around 5 months: roughly half of babies will do around eight hours on some nights. Not every night.
- 4–5 months and again at 8–9 months: plenty of babies who had started doing longer stretches begin waking more again. This is normal and not something you've caused.
- Through the first year: many babies continue to wake at night, and that's still within normal.
Night waking isn't a fault to be fixed. Babies wake at the end of each sleep cycle, and night feeds help maintain milk supply if you're breastfeeding. It's worth saying plainly: the friend whose baby "slept through from six weeks" is not describing a technique you failed to apply.
Safer sleep — the part that isn't optional
Everything above is about what's typical. This bit is about what's safe, and it applies to every single sleep, naps included.
The safer sleep basics
- On their back, for every sleep, day and night — not their front or side
- In their own clear sleep space — a cot, Moses basket or bedside crib, with nothing in it but a firm, flat, waterproof mattress and lightweight bedding
- No pillows, duvets, cot bumpers, pods, nests, sleep positioners or toys
- In the same room as you for all sleeps for at least the first six months
- Room at 16–20°C, and don't let them get too hot
- Feet to foot if you use blankets — feet at the bottom of the cot, blankets tucked in no higher than the shoulders
- Smoke-free, before and after birth
Never sleep with your baby on a sofa or armchair — it carries a significantly higher risk than any other sleeping arrangement. If you think you might doze off during a night feed, feed in bed with the space cleared rather than on the sofa. The Lullaby Trust has full guidance, including advice for parents who bed-share.
One more thing that surprises people: once a baby can roll both ways on their own, they'll find their own position, and you don't need to get up all night turning them back. Still always place them down on their back.
When to speak to a midwife, health visitor or GP
Worth a conversation if…
- Your newborn is very sleepy and not waking for feeds — in the early weeks they should wake to feed roughly every two to four hours
- You're having to wake them for most feeds, or they fall asleep almost immediately every time
- Sleepiness comes alongside fewer wet nappies, poor weight gain, or jaundice
- Your baby seems to be sleeping far less than the range above and is unsettled, hard to console, or not feeding well
- You're worried about their breathing during sleep — noisy, laboured, or long pauses
Get urgent advice — call 111, or 999 if your baby seems seriously unwell
- Your baby is very difficult to wake, unusually floppy, or unresponsive
- They're breathing very fast, grunting, or struggling to breathe
- They have a temperature of 38°C or above and are under 3 months old
- Their skin looks pale, blotchy, blue or mottled
And a word about your own sleep
The advice to "sleep when the baby sleeps" is easy to resent, but the logic underneath it holds: in the newborn weeks the only way to get enough sleep is to take it in fragments, at odd hours, whenever it's available. That usually means one parent going to bed at 8pm while the other takes the first shift, and the housework not getting done.
If you're finding the exhaustion is tipping into something heavier — persistent low mood, anxiety, or feeling unable to cope — please tell your health visitor or GP. That's common, treatable, and precisely what they're there for.
Why sleep is the hardest thing to track
Nappies you can count. Feeds you mostly remember. Sleep is genuinely difficult, because it's scattered across 24 hours, half of it happens while you're asleep yourself, and it's often the other parent who put them down.
Which means the question "how much did she actually sleep yesterday?" is usually unanswerable — and it's the exact question a health visitor asks. Working it out from memory at the appointment, with two people half-remembering different naps, gets you a number neither of you would bet on.
A running total beats reconstruction. However you keep it — a notebook by the cot, a shared note on your phones, or an app you both log into — what matters is that whoever put the baby down is the one who records it.
Start a timer. Stop it. That's it.
Baby Log has a live sleep timer that syncs between both parents in real time, so the total is always there whether you were the one on shift or not.
Get the app — it's freeSources: NHS guidance on baby sleep patterns and safer sleep, and The Lullaby Trust's safer sleep information.
This article is general information, not medical advice. Every baby is different. If you're worried about your baby's sleep, breathing or feeding, contact your midwife, health visitor or GP — or call 111 out of hours.