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Wake windows by age: chart and calculator

Enter your baby's age and when they woke up. You will get the time window when the next nap is most likely to go well.

By the Swaddle team · Reviewed October 25, 2026

Wake window calculator

Next sleep most likely between

11:05 am - 11:30 am

Wake window at this age: about 1 h 50 min (usual range 75-120 min).

Watch for sleepy signs too: they beat any clock. The Swaddle app does this for you and adjusts to your baby's own rhythm after a few days of logging.

Wake windows by age chart

AgeTypical wake window
0-4 weeks35-60 min
4-12 weeks60-90 min
3-4 months75-120 min
5-7 months2-3 h
7-10 months2.5-3.5 h
11-14 months3-4 h
14-24 months4-6 h

Ranges match commonly published guidance from pediatric sleep sources and are a starting point, not a rule. The first window of the day is usually the shortest and the last one before bedtime the longest.

What is a wake window?

A wake window is the time your baby spends awake between sleeps, measured from the moment they wake to the moment they fall asleep again. It includes feeds, diaper changes, play and the time it takes to settle.

Wake windows work because of sleep pressure: the longer anyone is awake, the stronger the drive to sleep becomes. Babies build sleep pressure quickly, which is why a newborn is ready to sleep again after 45 minutes while a toddler can last five hours. Put a baby down before enough pressure has built and they may not fall asleep. Wait too long and they can become overtired and harder to settle.

Signs your baby is getting sleepy

Early signs: start winding down

  • Staring into space, looking away
  • Quieter, less interested in toys
  • Red eyebrows or eyelids
  • Slower, heavier movements

Late signs: they are already tired

  • Yawning again and again
  • Rubbing eyes, pulling ears
  • Fussing, arching, crying
  • A sudden "second wind" burst of energy

Is the window too short or too long?

  • Too short: takes 20+ minutes to fall asleep, chats or plays in the crib, or wakes after 20-30 minutes happy. Try adding 10 to 15 minutes.
  • Too long: cries hard at the start of a nap, falls asleep quickly but wakes upset, or bedtime turns into a battle. Try bringing the nap 10 to 15 minutes earlier.

Change one window at a time and give it 2 to 3 days before deciding if it worked.

Wake windows by month

Each age page has a sample schedule, nap counts and what changes that month:

Questions parents ask

What is a wake window?

A wake window is the stretch of time a baby is awake between two sleeps, from when they wake up to when they fall asleep again. It grows from under an hour in newborns to about 5-6 hours at age 2.

Are wake windows backed by science?

Partly. That babies can stay awake longer as they grow is well established, and so is the build-up of sleep pressure while awake. The exact minute ranges are practical guidelines from pediatric sleep experts, not fixed medical rules, so use them as a starting point and watch your baby.

Does the wake window include feeding time?

Yes. The wake window counts all the time your baby is awake, including feeds, diaper changes and the time it takes to fall asleep.

What happens if a wake window is too long?

An overtired baby can be fussy, fight sleep, take short naps and wake more at night. Bringing the next nap or bedtime a little earlier usually helps.

What happens if a wake window is too short?

A baby who is not tired enough may take a long time to fall asleep, play in the crib or take a short nap. Try stretching the window by 10 to 15 minutes.

Sources

  1. American Academy of Pediatrics: How to Keep Your Sleeping Baby Safe (healthychildren.org)
  2. Paruthi S, et al. Recommended amount of sleep for pediatric populations: AASM consensus statement. J Clin Sleep Med 2016
  3. Hirshkowitz M, et al. National Sleep Foundation’s sleep time duration recommendations. Sleep Health 2015
  4. Moon RY, et al. Sleep-related infant deaths: updated 2022 recommendations. Pediatrics 2022
  5. Cleveland Clinic: Wake windows by age
  6. Galland BC, et al. Normal sleep patterns in infants and children: a systematic review. Sleep Med Rev 2012

This page is general information from the sources above, written by the Swaddle team and last reviewed October 25, 2026. It is not medical advice and it is not a substitute for your pediatrician. Every baby is different. If something feels wrong, call your doctor. In an emergency, call 911 (US) or your local emergency number. How we write these pages.

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