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Wake Window Calculator by Age

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Free baby sleep tool

Use this wake window calculator to find the right time for your baby's next nap or bedtime, based on their age and when they last woke up. It also includes a wake windows by age chart from newborn to 3 years.

Newborn to 3 years
Exact nap time
Sleepy-cue reminders

By Alppi Baby Editorial Team · Updated November 2026 · Sleep totals from AASM & AAP guidance

Side-by-side photo of an overtired crying baby and a happy, well-rested baby

Catch the window, skip the meltdown

When Should My Baby Nap?

Enter age and wake-up time to see the next sleep window

Baby's ageBorn early? Use their adjusted age (age minus weeks early).

Baby woke up atFrom the morning wake-up or the end of the last nap.

Which wake window is this?

First of the day Between naps Before bedtime

The last nap was short (under 45 minutes)

Choose your baby's age and wake-up time, then tap Find the next nap time.

Key takeaways

A wake window is how long your baby can stay awake between sleeps. It grows from about 35–60 minutes for newborns to 5–6 hours by age 2.
The first window of the day is usually the shortest, and the one before bedtime is the longest.
Start winding down about 15 minutes before the window opens to avoid an overtired baby.
Sleepy cues always beat the clock. Use wake windows as a starting point.

What is a wake window?

A wake window is the stretch of time your baby can comfortably stay awake between sleeps. That's from waking up in the morning to the first nap, between naps, and from the last nap to bedtime.

Babies have a short limit on how long they can stay awake. Putting them down at the right time makes it easier for them to fall asleep and stay asleep.

Too short

Not enough sleep pressure. Baby fights the nap, chats in the crib, or takes a short catnap.

Just right

Baby is drowsy but not frantic, settles more easily, and often naps longer.

Too long

Overtired babies get a second wind from stress hormones. Expect crying, short naps and night wakings.

Wake windows by age chart

Use this chart to see how long your baby can typically stay awake at each age. The calculator above uses these ranges.

Age	Wake window	Naps per day	Total sleep in 24 hours
0–4 weeks	35–60 minutes	4–8 (often short)	14–17 hours
4–12 weeks	60–90 minutes	4–5	14–17 hours
3–4 months	75–120 minutes	3–4	12–16 hours (14–17 at 3 months)
5–7 months	2–3 hours	3	12–16 hours
7–10 months	2.5–3.5 hours	2	12–16 hours
11–14 months	3–4 hours	1–2	11–14 hours
14–24 months	4–6 hours	1	11–14 hours
2–3 years	5–6 hours	0–1	11–14 hours

Wake windows reflect common pediatric sleep-consultant ranges. Total sleep follows the National Sleep Foundation (0–3 months) and the American Academy of Sleep Medicine consensus, endorsed by the AAP (4 months and up). Ranges overlap because babies develop at different rates.

How the wake window calculator works

The calculator starts with the typical range for your baby's age. It then narrows that range depending on which wake window of the day you're in:

First window of the day: usually the shortest, so we use the lower half of the range.
Between naps: we target the middle 50% of the range.
Before bedtime: usually the longest, so we use the upper half of the range.
After a short nap (under 45 minutes): we shorten the window, since baby didn't fully recharge.

It also suggests when to start winding down, about 15 minutes before the window opens. That gives you time for a quick diaper change, a feed and a sleep sack before baby gets overtired.

Sleepy cues to watch for

Wake windows are a guide, not a rule. Your baby's cues always come first:

Early cues: staring into space, less interest in toys, quieter, slower movements, red eyebrows or eyelids.
Clear cues: yawning, rubbing eyes or ears, turning away from faces and light.
Late cues (overtired): fussing, arching, crying, clinginess, or a sudden burst of hyper energy.

Tip: Aim to start your wind-down at the early cues. By the time baby is crying and rubbing eyes, the ideal window has often passed.

Tips for using wake windows

Track for 3 days. Note when baby wakes, shows cues and falls asleep. Patterns appear quickly.
Adjust in 15-minute steps. If naps are short or baby fights sleep, try a slightly shorter or longer window for a few days.
Keep a short, repeatable wind-down. Diaper, sleep sack, dim lights, a song. The same steps every time signal sleep.
Follow safe sleep basics. Back to sleep, on a flat firm surface, with no loose blankets. A wearable blanket like a sleep sack keeps baby cozy safely.

Want a full day planned out? Use our Baby Sleep Schedule & Bedtime Calculator to map every nap and bedtime from your baby's wake-up time.

Frequently asked questions

How long should a newborn be awake?

In the first month, most newborns can only handle about 35 to 60 minutes awake, and that includes feeding and diaper changes. By 2 to 3 months, it stretches to around 60 to 90 minutes.

What is the wake window for a 4-month-old?

Most 4-month-olds do well with wake windows of about 75 minutes to 2 hours, usually across 3 to 4 naps. The first window of the day tends to be the shortest.

What is the wake window for a 6-month-old?

Usually about 2 to 3 hours, with 3 naps a day. The window before bedtime is often closer to 3 hours.

What is the wake window for a 9-month-old?

Around 2.5 to 3.5 hours, typically with 2 naps. Many babies drop the third nap between 7 and 9 months.

What are the wake windows for a 1-year-old?

Most 12-month-olds stay awake about 3 to 4 hours between sleeps. Many still take 2 naps until they move to one nap between about 13 and 18 months.

Do wake windows include feeding time?

Yes. A wake window counts all awake time, from when baby wakes up to when they fall asleep, including feeds, diaper changes and the wind-down routine.

Are wake windows scientifically proven?

Wake windows are a practical tool, not a medical standard. They're based on how sleep pressure builds during the day and on what pediatric sleep specialists see in many babies. Total daily sleep needs, though, are backed by AASM and AAP guidance. Use wake windows as a starting point and adjust to your baby's cues.

What happens if my baby is overtired?

Overtired babies often get a burst of stress hormones that makes it harder to fall asleep. That can lead to crying at bedtime, short naps, and more night wakings. Try a slightly shorter wake window and an earlier bedtime for a few days.

Should I use adjusted age for a premature baby?

Yes. Most pediatricians suggest using adjusted (corrected) age for sleep expectations until about age 2. Subtract the number of weeks your baby was born early from their actual age.

Sources

How we made this tool. Wake-window ranges reflect widely used pediatric sleep-consultant guidance. Total sleep recommendations come from the American Academy of Sleep Medicine consensus statement (endorsed by the AAP) and the National Sleep Foundation for babies under 4 months. Written by the Alppi Baby Editorial Team and last updated November 2026.

This tool offers general sleep guidance and is not medical advice. Every baby is different. Talk to your pediatrician if your baby is unusually sleepy, hard to wake, snores loudly, has trouble breathing during sleep, or isn't gaining weight.