Baby Sleep Schedule by Month: 0–12 Months (With Wake Windows)

Last updated: September 18, 2026

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Ask ten parents what their baby’s sleep schedule looked like at four months and you will get ten different answers — and all of them can be true. Sleep schedules shift fast in the first year, and the numbers that matter most are the ones that tell you how long a baby can comfortably stay awake at each age.

This guide gives you the typical ranges by month, the signs that it is time to adjust, and the two things that matter more than any schedule: safe sleep and your pediatrician’s guidance.

This is general information, not medical advice. Every baby is different. Talk to your child’s pediatrician about your baby’s sleep, especially if you are worried about weight gain, breathing or extreme fussiness.

The one number to know: wake windows

A “wake window” is how long a baby can comfortably stay awake between sleeps. Get it roughly right and the day organizes itself; get it too long and you get an overtired baby who fights sleep — which is the most common reason a “schedule” seems to stop working overnight.

Two rules hold across the whole first year:

Sleep begets sleep. A well-rested baby falls asleep more easily than an overtired one.
Watch the baby, not the clock. The ranges below are a starting point; your baby’s own cues beat any table.

Typical ranges by month

These are the commonly used ranges. Total sleep includes nights plus naps.

0–1 month (newborn): total sleep around 14–17 hours in 24h. Wake windows are very short — often 45–60 minutes — and days and nights are not yet distinguished. At this age, feed on demand and do not try to schedule.
2–3 months: total sleep around 14–17 hours. Wake windows stretch to roughly 60–90 minutes. Nights begin to consolidate, and you may see one longer stretch appear.
4–6 months: total sleep around 12–16 hours, usually 3 naps. Wake windows roughly 1.5–2.5 hours. This is the age where a light routine (same order of steps before each sleep) starts doing real work.
7–9 months: total sleep around 12–15 hours, often 2–3 naps. Wake windows roughly 2.5–3.5 hours. The third nap usually drops somewhere in here.
10–12 months: total sleep around 12–14 hours, typically 2 naps. Wake windows roughly 3–4 hours, with the longest stretch before bed. A morning nap may start shortening as you approach the first birthday.

Two transitions cause most of the trouble: the 4-month change (sleep cycles mature, and naps suddenly get shorter) and the 3-to-2 nap drop (usually between 6 and 9 months). Both are developmental, not a failure of your routine.

How to build a routine that survives the changes

The schedule that works is not the most precise one — it is the one you can repeat when you are exhausted. Keep the sequence fixed and let the clock move:

Same order every time: diaper, feed, brief wind-down, into the sleep space. The order signals what is coming; the timing is secondary.
Light and noise cues: bright and normal-noise during the day, dim and quiet at night. Newborns need that contrast to learn the difference.
A consistent sleep space and sleep surface. Which brings us to the part that matters more than any schedule.

Safe sleep comes before any schedule

Whatever the wake windows say, the safety rules do not change:

Baby sleeps on their back, on a firm, flat surface, for every sleep — naps included.
Nothing else in the sleep space: no pillows, blankets, bumpers, toys or positioners.
An approved crib or bassinet with a firm mattress and a fitted sheet is the setup. A mattress that is too soft or that does not fit the frame is a hazard, not a comfort upgrade.
Room-sharing (same room, separate surface) is recommended for the first months; bed-sharing is not.

If you are choosing a mattress for a crib or bassinet, breathability and a firm, flat surface are the specifications that matter. See current crib mattress options and specifications.

If your baby’s sleep space is in your room, the same rules apply — and a sound machine placed well away from the sleep surface, at a low volume, is the tool most parents end up using. See current sound machine options.

Signs it is time to adjust the schedule

Fighting every nap and bedtime for more than a few days: usually the wake window is now too short — add 15 minutes of awake time and see.
Waking very early and “wired”: usually too long a wake window before bed, not too little sleep.
A nap that suddenly shrinks to 30 minutes at around four months: normal development. Shorten the wake window slightly and give it two weeks.
Night feeds changing pattern: check with your pediatrician before dropping any feed, especially in the first months.

Frequently asked questions

Should I wake a sleeping baby to keep the schedule?
In the newborn weeks, follow your pediatrician’s feeding guidance rather than a clock-based schedule. Later, waking a baby to protect the bedtime is occasionally useful, but a consistently over-tired baby is the bigger risk.

Do I need a sleep-training method?
Not necessarily. A repeatable routine, correct wake windows and a safe, boring sleep space do a lot of the work. If you want to use a specific method, ask your pediatrician which one fits your baby’s age and health history.

What about sleep regressions?
They tend to line up with developmental leaps (around 4, 8 and 12 months), but “regression” and “the schedule needs adjusting” look identical from the outside. Change one thing at a time, and give it a week before changing another.

What should I look for in a crib mattress?
Firm, flat and correctly sized for the crib, with a fitted sheet that stays tight. Breathability is a comfort and peace-of-mind feature on top of that — not a substitute for a firm surface.

We update this guide as recommendations change. This is general information, not medical advice — please follow your pediatrician’s guidance for your baby.