A wake window is the stretch a baby is awake between sleeps — feeding, changing and playing included. It is a useful way to time naps, and it is worth knowing up front that the term comes from sleep consultants rather than from the medical literature. Treat the numbers below as starting estimates that your baby is allowed to disagree with.
| Age | Awake between sleeps | Naps a day |
|---|---|---|
| 0–2 months | 35–90 min | 4–6 |
| 3–5 months | 75–150 min | 3–5 |
| 6–8 months | 120–180 min | 2–3 |
| 9–11 months | 150–210 min | 2 |
| 12–17 months | 180–240 min | 1–2 |
| 18–24 months | 240–360 min | 1 |
Turn your baby's windows into a day
Start the clock when your baby wakes, not when the last nap ended, and count the whole awake stretch. Aim for somewhere inside the range rather than at a specific minute — the first window of the day is usually the shortest and the one before bedtime the longest.
Two failure modes look almost identical from the outside. An overtired baby fights sleep because the window ran long; an under-tired one fights it because the window was too short. If a nap goes badly, move the next window by fifteen minutes in one direction and give it several days before judging it.
Full day-by-day schedules with clock times live on the sleep schedules by age pages.
Tier 1 — evidence-based The ranges on this page are the consensus sleep totals and nap counts below. The phrase "wake window" itself is a Tier 2 practice-based heuristic: it does not appear in the pediatric sleep-medicine literature, so treat the window lengths as a starting estimate and let your baby's sleepy cues override them.