# Wake window calculator by age

> Source: https://www.healthcalcpro.com/baby/wake-windows · Last reviewed: 2026-09-28

A wake window is how long a baby stays awake between sleeps. It grows with age: often under an hour for newborns, one to two hours at three to five months, and three to four hours around the first birthday. Enter your baby's age and when they woke to see a typical window for the next nap.

**Important:** Wake windows are common rules of thumb, not a medical standard, and every baby is different. Follow your baby's sleepy cues and your pediatrician's advice. Always place babies on their back to sleep, on a firm, flat surface.

Use the interactive calculator at https://www.healthcalcpro.com/baby/wake-windows. It runs in the browser and stores nothing.

## Wake windows by age

The ranges below are the ones parents and sleep consultants commonly use. Total sleep ranges come from published consensus statements: the National Sleep Foundation for babies up to three months, and the American Academy of Sleep Medicine from four months to two years.

Typical wake windows, naps and total sleep in 24 hours

| Age | Wake window | Naps | Total sleep (source) |
| --- | --- | --- | --- |
| 0 to 4 weeks | 35 to 60 min | Many, irregular | 14 to 17 h (NSF) |
| 1 to 3 months | 60 to 90 min | 4 to 5 | 14 to 17 h (NSF) |
| 3 to 5 months | 75 min to 2 h | 3 to 4 | 12 to 16 h (AASM, from 4 months) |
| 5 to 7 months | 2 to 3 h | 3 | 12 to 16 h (AASM) |
| 7 to 10 months | 2.5 to 3.5 h | 2 | 12 to 16 h (AASM) |
| 10 to 14 months | 3 to 4 h | 1 to 2 | 11 to 14 h from 12 months (AASM) |
| 14 to 24 months | 4 to 6 h | 1 | 11 to 14 h (AASM) |

## Should I follow the wake window or my baby's cues?

Your baby's cues come first. Yawning, rubbing eyes, looking away and fussing usually mean it is time to sleep, even if the window is not over. The window is most useful as a reminder to start winding down before your baby becomes overtired.

## When to talk to your pediatrician

Call your pediatrician if your baby:

- Is very hard to wake, or sleeps much more than usual
- Has pauses in breathing, loud snoring or struggles to breathe during sleep
- Is not feeding well, or has fewer wet diapers than usual
- Seems unusually irritable or unwell

## Frequently asked questions

### Should I use my baby's corrected age if they were born early?

Many pediatricians suggest using corrected age (age from the due date) for sleep and development milestones in premature babies. Ask your pediatrician what they recommend for your baby.

### Why does the first wake window of the day often feel shorter?

Many babies manage a shorter stretch after the morning wake-up and longer ones later in the day. Use the lower end of the range for the first nap.

### Is anything I enter stored?

No. The calculator runs in your browser and nothing is sent to us.

## Sources

- [American Academy of Sleep Medicine: Child sleep duration health advisory (based on Paruthi et al., J Clin Sleep Med, 2016)](https://aasm.org/advocacy/position-statements/child-sleep-duration-health-advisory/)
- [National Sleep Foundation: Sleep duration recommendations (Hirshkowitz et al., 2015)](https://www.thensf.org/how-many-hours-of-sleep-do-you-really-need/)
- [HealthyChildren.org (AAP): Safe sleep for your baby](https://www.healthychildren.org/English/ages-stages/baby/sleep/Pages/a-parents-guide-to-safe-sleep.aspx)

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