Baby wake windows by age

Short answer: a wake window is how long a baby is awake between two sleeps. Newborns manage about 45 to 90 minutes. That stretches to roughly 1.5–2.5 hours at 4–6 months, 2–3 hours at 7–9 months, 3–5 hours in the second year and 4–6 hours by age 2. The first window of the day is usually the shortest and the one before bedtime the longest.

Wake windows by age

These are typical ranges, not rules. There is no official wake window chart from the AAP or the NHS. What pediatric sleep bodies do publish is total sleep per day (see the sleep schedule guide), and wake windows are the practical way parents spread that sleep through the day.

Why the first wake window is the shortest

Sleep pressure builds through the day. After a full night, most babies get tired again quickly, so the window before the first nap sits at the low end of the range. Each later window is a bit longer, and the stretch before bedtime is usually the longest. For a 7-month-old on two naps that might look like 2 hours before nap one, 2.5 hours before nap two and 3 hours before bed.

How nap length changes the next window

A short nap (under about 35 minutes) leaves less sleep in the tank, so the next window is often a little shorter. A long nap (90 minutes or more) can push the next one later. If your baby wakes early from a nap and seems content, it's fine to go with it and watch for cues.

Signs your baby is ready to sleep

• Yawning, rubbing eyes or ears, staring off
• Fussing, turning away from toys or faces, arching
• Red eyebrows or eyelids in young babies
• Suddenly wired and giggly after being calm (a sign of being overtired in some babies)

Use the clock to know when to start watching, and your baby's cues to decide when to start the wind-down. Starting 10–15 minutes before the end of the window gives you time for a diaper, a feed or a song.

Finding your own baby's wake windows

1. Log when your baby falls asleep and wakes for a week. Most babies show a pattern within a few days.
2. Look at each nap of the day separately: the gap before nap one, before nap two, and before bedtime.
3. Note which gaps led to easy naps and which led to fighting sleep or a short nap.
4. Adjust by 10–15 minutes at a time, and expect the windows to stretch every few weeks.

When the windows stop working

If naps that used to be easy turn into a fight, or your baby starts refusing the last nap of the day, they may be ready for longer windows and one fewer nap. Common transitions are 4 to 3 naps around 4 months, 3 to 2 around 6–8 months and 2 to 1 around 13–18 months.