How much sleep does a baby need? A calm look at the numbers

19 August 2026 · 6 min read · by Aleksandr Zhadko, developer of Rostik and dad of two

“Is my baby sleeping enough?” is probably the most common question of the first year — and the least well answered by a single number. Real babies vary enormously, and the healthy range is far wider than most parents expect.

Typical sleep totals by age

Age	Total sleep / 24 h	Of which night
0–3 months	14–17 hours	8–9 h, broken
4–6 months	12–15 hours	9–11 h
7–11 months	12–15 hours	10–12 h
12–24 months	11–14 hours	10–12 h

Two honest caveats. First, these are population ranges: individual healthy babies routinely sleep an hour or two outside them. Newborn totals in particular can span roughly 11 to 19 hours. Second, the number that matters is not one day but the weekly pattern — every baby has chaotic days.

These ranges describe typical healthy, full-term babies and are not targets. If your baby seems constantly exhausted, unusually hard to wake, or you are worried about their sleep or breathing, speak to your GP or health visitor.

Night waking is not a malfunction

Babies are designed to wake at night. Sleep cycles at this age are short — around 40–50 minutes — and surfacing between them is normal. What changes over the first year is not whether babies wake, but whether they need help returning to sleep.

Frequent night waking with quick resettling is a very different picture from a baby who is awake and distressed for long stretches. Recording a few nights honestly — wake time, how long, what helped — usually shows the real pattern is better (or at least more regular) than the 4 a.m. impression suggests.

Signs the sleep amount is probably fine

Baby is generally content for stretches of the day, not only ever crying or asleep;
waking happens but the baby can be settled;
weight gain and feeding are on track at check-ups;
there are calm, alert periods — the famous “quietly staring at the ceiling fan” time counts.

Signs worth acting on: it takes over an hour of fighting to achieve every single nap, evenings dissolve into inconsolable crying at the same time daily, or day sleep only ever happens in motion. None of these are emergencies — they're signals to look at timing, usually wake windows, before anything more drastic.

How to know what your baby actually does

Memory is the worst sleep tracker there is. Tired brains overweight the bad nights and forget the decent ones. A week of simple records — when sleep started and ended, nothing more — replaces the impression with a picture, and the picture is what a health visitor or GP can actually work with.

Rostik shows the week, not just the night

Sleep lands as arcs on a 24-hour clock face, so a week of days can be compared at a glance — and Rostik learns your baby's own rhythm to suggest when the next nap is likely due.

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Rostik is a parental logging app, not a medical device. This article is general information, not medical advice — for concerns about your baby's sleep or health, speak to your GP or health visitor.