Baby Sleep by Age: What's Typical

Infant sleep advice is a minefield of confident opinions. The one genuinely useful thing is a rough sense of how much sleep is typical at each age, and how it redistributes between night and day — because most of what feels like a problem is a normal stage.

What is typical, by age

From the sleep schedule tool:

Age	Total / 24h	Night	Day	Naps	Wake window
0–1 month	14–17 h	8–9 h	6–8 h	4–6	45 min–1 h
1–3 months	14–16 h	8–10 h	5–7 h	3–5	1–1.75 h
4–6 months	13–15 h	10–11 h	3–4.5 h	3	1.75–2.5 h
7–9 months	12–15 h	10–12 h	2.5–3.5 h	2–3	2.5–3 h
10–12 months	12–15 h	11–12 h	2–3 h	2	3–4 h
12+ months	11–14 h	10–12 h	1.5–3 h	1–2	4–5.5 h

The total barely moves; the distribution moves enormously

Read the first column down and the total falls only modestly — from 14–17 hours to 11–14 across the whole first year. Now read the night and day columns: night sleep climbs from 8–9 hours to 11–12, and day sleep collapses from 6–8 hours to 1.5–3.

That is the real story of the first year. A baby is not sleeping much less overall; the sleep is consolidating into the night, which is the change parents actually feel.

Wake windows are the practically useful number

The wake window — how long a baby can comfortably stay awake between sleeps — goes from about 45 minutes at birth to 4–5.5 hours after the first birthday. It is the figure most worth knowing day to day, because overtiredness makes settling harder rather than easier.

A newborn who has been awake for two hours is well past their window, and the resulting difficulty getting them down reads as a sleep problem when it is a timing one. Watching the clock a little at this age often does more than any technique.

Ranges are wide for a reason

Every figure above is a range, and the ranges are broad because babies genuinely differ. A twelve-month-old sleeping 12 hours and one sleeping 15 are both inside normal.

Averages also conceal the shape of a night. Waking overnight is normal well into the first year and beyond, and "sleeping through" is not a milestone with a fixed date. A baby who wakes and resettles quickly is doing something different from one who wakes fully, even though both are night wakings.

Where the schedule tool stops, and safe sleep begins

This tool answers when and how much. It has nothing to say about how a baby should be put down, and that is the part with the evidence behind it.

Safe-sleep guidance is consistent internationally: on the back for every sleep including naps, on a firm flat surface designed for infant sleep, nothing loose in the sleep space, room-sharing without bed-sharing in the early months, not overheated, smoke-free. None of the timings on this page modifies any of that, and if a schedule ever seems to conflict with safe sleep, the safe-sleep guidance wins.

What is worth raising with a professional

Sleep varies so much that most concerns are answered by "this is normal for now". The ones worth mentioning rather than researching: sleep that has changed abruptly and stayed changed, breathing that seems laboured or noisy during sleep, a baby who is very difficult to rouse, or exhaustion that is affecting your own health — which is a legitimate reason to ask for help in its own right.

These figures are general population ranges for orientation, not medical advice, and your health visitor or paediatrician is the source for anything about your baby specifically.

Regressions, and why they are usually developmental

Periods where sleep abruptly worsens are widely reported by parents and commonly coincide with developmental leaps — learning to roll, to sit, to pull up, and later with separation awareness and language.

The pattern is recognisable: a baby who was settling well starts waking, often around the time a new skill is emerging, and settles again over a couple of weeks. It reads as a step backwards and is generally a sign of something moving forward.

Knowing that does not make the fortnight easier, but it does change what you do about it — riding it out is usually more effective than restructuring a routine that was working.

Dropping a nap

The nap counts in the table fall in steps, and each transition is a period of disruption. Three naps to two, and later two to one, are the two big ones in the first eighteen months.

The signals are usually the same: a baby consistently refusing one of the naps, or taking it and then not settling at bedtime. Wake windows are the useful guide here — if a baby's window has grown beyond what the current schedule assumes, the schedule is the thing that needs to change.

Your own sleep counts

One thing worth saying plainly. Parental exhaustion is not a minor side effect — it affects health, mood and safety, including the safety of driving and of night-time care.

Asking for help with it is a reasonable thing to raise with a health visitor or GP, and it is a more common conversation than most new parents expect.