Free wake window calculator

Wake windows by age, and when the next nap is due.

Pick your baby's age and when they woke up. You'll get the typical window for the next nap, drawn from published guidance. Every baby is different, so treat it as a starting point, not a schedule.

Woke up at

Typical wake window: 1¼–2½ h

Next nap 8:15 AM to 9:30 AM

With a wake-up at 7:00 AM, the next nap window is 8:15 AM to 9:30 AM.

3–5 months. Naps a day: 3–4. Sleep in 24 hours: 12–16 h from 4 months.

Wake window chart

Typical wake windows, naps and sleep by age

Newborns usually manage 30 to 60 minutes awake. That stretches to 2 to 3 hours around six months and 5 to 6 hours before the single nap of a two-year-old.

Age	Wake window	Naps a day	Sleep in 24 hours
0–4 weeks	30–60 min^CC	Varies, around the clock^KH	14–17 h^NICHD
1–3 months	1–2 h^CC	4–5, still irregular^HB	14–17 h^NICHD
3–5 months	1¼–2½ h^CCHB	3–4^HB	12–16 h from 4 months^AASM
5–7 months	2–3 h^CCHB	2–3^KHHWA	12–16 h^AASM
7–10 months	2½–3½ h^CCHB	2^HWAHB	12–16 h^AASM
10–12 months	3–4 h^CCHB	2^HWAHB	12–16 h^AASM
12–18 months	3¼–5 h^HB	2, moving to 1^HWAKH	11–14 h^AASM
18 months–2 years	5–6 h^HB	1^KHHWA	11–14 h^AASM

Where sources disagree we show the range they share. Medical sources publish wake windows only up to 12 months; the toddler rows come from Huckleberry's pediatrician-reviewed guides. Total sleep under 4 months is the National Sleep Foundation figure, cited by the NIH.

Watch the baby, not the clock

Wake windows are averages. Cleveland Clinic notes they vary from day to day and nap to nap, so sleepy cues are the better signal when the two disagree.^CCHWA

Yawning
Rubbing eyes
Blinking more, or staring off
Less interest in play
Fussing
Jerky arm and leg movements

A note on safe sleep

The American Academy of Pediatrics recommends placing your baby on their back for every sleep, on a firm, flat surface with no soft objects or loose bedding, and sharing a room but not a bed.^AAP

This page shares typical ranges and isn't medical advice. Talk to your pediatrician about your baby's sleep.

The Dobbin app

Let your watch count the awake time.

Dobbin's sleep complication shows how long your baby has slept during a nap, then flips to how long they've been awake. Start the next nap from your wrist and everyone in the household sees it.

See the baby sleep tracker

3:07

2h 23m1h 12m

TUE 14

FAQ

Wake window questions

What is a wake window?

A wake window is the stretch of time a baby is awake between one sleep and the next. Many parents use typical wake windows for their baby's age as a rough guide for when to start the next nap.

How long should a newborn be awake?

Cleveland Clinic gives 30 to 60 minutes for babies in their first month, and 1 to 2 hours by around 1 to 3 months. Many newborns fall asleep sooner, and that's normal.

What are typical wake windows at 4 months?

Around 1 hour 15 minutes to 2 hours 30 minutes, usually across three or four naps. Babies vary from day to day and nap to nap.

Are wake windows a medical rule?

No. They're averages, not targets. Watch your baby's sleepy cues, and talk to your pediatrician if you're worried about how your baby is sleeping.

Sources

CCWake Windows by Age, Cleveland Clinic
HBBaby wake windows by age, Huckleberry (pediatrician-reviewed)
HWASleep 6 months to 3 years, HealthyWA, Government of Western Australia
KHNaps, KidsHealth from Nemours
AASMRecommended Amount of Sleep for Pediatric Populations (endorsed by the AAP), American Academy of Sleep Medicine
NICHDHow much sleep do I need?, NICHD, National Institutes of Health
AAPHow to Keep Your Sleeping Baby Safe, American Academy of Pediatrics, HealthyChildren.org

Sources checked October 1, 2026.

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