Wake windows by age: how to predict your baby's next nap

Wake windows by age

A wake window runs from the moment your baby wakes to the moment they fall asleep again. It includes feeds, play and the wind-down.

These ranges are rules of thumb used by baby sleep educators, and they are the starting values built into Nova Baby. They are not clinical standards, they overlap, and plenty of healthy babies sit outside them. A chart cannot assess your baby. Use the range as a starting point and let your baby's own pattern do the rest.

In the first weeks, let feeds lead. Newborns vary a great deal in how long and how often they sleep, and repeated waking is common in the early months. A wake window is never a reason to delay a feed, and if your midwife or feeding team has given you a plan, follow that. Our parent field guide covers what to expect from newborn sleep, from NHS guidance.

Working out wake windows for a 6 month old

Around 6 months most guidance lands between 2 and 3 hours awake. The table steps up at 26 weeks: 1 hour 45 to 2 hours 30 just before, and 2 hours 30 to 3 hours after. A baby does not change overnight at 26 weeks, so expect yours to be somewhere in that overlap.

A sample day for a baby on 2 hours 30:

The first window of the day is often the shortest and the last one the longest, so a single number is only a starting point.

How to find your own baby's wake window

1. Log for a week. Write down every time your baby falls asleep and every time they wake. Five to seven days is enough to start.
2. Measure each gap. For every sleep, count the minutes from the previous wake-up to falling asleep.
3. Group by nap. Keep the gap before the first nap separate from the gap before the second, and so on.
4. Take the middle value. Sort each group and pick the middle one (the median). It ignores the one day everything went sideways, which an average does not.
5. Drop the obvious mistakes. A 15 minute gap is a resettle, not a wake window. A 7 hour gap means a nap was missed in the log.
6. Check it against the table. If your number is inside or near the range for the age, use it. Add it to the last wake time and allow 15 to 20 minutes either side.
7. Redo it every couple of weeks. Wake windows stretch as babies grow, so an old number goes stale.

Use the clock and your baby together

Treat the start of the window as the time to begin watching for tired signs. Common ones are yawning, rubbing eyes, staring into the distance, turning away from play and getting fussy. If those arrive before the window, start the wind-down. If the window arrives and your baby is bright and busy, give it a little longer.

Predictions tend to miss after a very short nap, on days out of routine, and when your baby is unwell. On those days lean on the signs more than the clock.

Let an app do the arithmetic

Steps one to seven are what Nova Baby's next sleep window does each time you log a wake-up. It uses the last 14 days, matches the nap of the day, takes the median, sets aside resettles and logging gaps, and blends the result with the age range. It shows a time range, a confidence level and the reason. It is free on iPhone.

Other apps predict naps too. Huckleberry's SweetSpot is part of its paid Plus plan, and Napper builds a daily schedule. Huckleberry vs Napper compares them.

When to ask for help

This page is general information, not medical advice. If you are worried about how your baby sleeps, feeds or grows, speak to your health visitor, GP or paediatrician. If your baby is unusually hard to wake or is not feeding normally, get medical help and do not rely on a sleep chart.

Questions

How do I work out wake windows for a 6 month old?

Start from 2 to 3 hours awake between sleeps. Log a week of sleeps, measure the gap before each nap, and take the middle value for each nap of the day. Add that to the last wake-up time and allow 15 to 20 minutes either side.

How do I predict my baby's next nap?

Add your baby's wake window to the time they last woke. Use the range for their age to begin with, then replace it with the middle value of their own recent gaps between sleeps. An app such as Nova Baby does this for you from the sleeps you log.

What is the wake window for a 4 month old?

About 1 hour 15 to 2 hours at 3 to 4 months, moving toward 1 hour 45 to 2 hours 30 between 4 and 6 months.

What is the wake window for a newborn?

About 45 minutes to 1 hour in the first five weeks, and 1 hour to 1 hour 30 from 6 to 11 weeks. Newborn sleep is irregular and feeding needs lead, so treat these loosely.

Does a wake window include feeding time?

Yes. It runs from waking up to falling asleep again, so it includes feeds, play and the wind-down.

Are wake windows backed by science?

They are rules of thumb from baby sleep educators, not clinical standards. The published ranges are wide and they overlap, which is why your own baby's recent pattern is the better guide.

Should I use my baby's actual age or adjusted age?

For a baby born early, use the age counted from the due date. Nova Baby does this automatically when a due date is set.