Wake Window Calculator
Enter your child's age in months to see their wake window.
Result
How it is calculated
The tool looks up the age in months in a fixed table of age bands, with no formula or interpolation. The bands, by age a, are: under 2 months 45–60 min; 2 to under 3 months 60–90 min; 3 to under 4 months 75–105 min; 4 to under 6 months 90–120 min; 6 to under 9 months 120–180 min; 9 to under 13 months 150–240 min; 13 to under 19 months 240–330 min; 19 to 36 months 300–360 min. Alongside the wake window in minutes, it shows the usual number of naps per day and a range for total sleep in 24 hours. Decimals are accepted, so 7.5 works, and 0 is valid for a newborn. Ages below 0 or above 36 months give no result. The values are typical figures for each band, not a prescription for an individual child.
Worked example
A baby aged 7 months. Check the bands: 7 is not under 6, but it is under 9, so the 6-to-under-9-month band applies. The wake window is 120–180 min, that is 2 to 3 hours between sleeps. The table lists 3 naps per day and total sleep of 12–15 hours per day. If the baby wakes at 7:00, the first nap would be due somewhere between 9:00 and 10:00.
Common mistakes
- Reading the range as an exact schedule. A window of 120–180 min means the span within which most babies of this age settle, so watch for tired signs inside it.
- Entering the age in weeks or years. The field is in months, so a 1-year-old is 12 and a 6-week-old is about 1.5.
- Using the corrected age of a baby born early without thinking about which age you meant to enter. The tool applies the band to whatever number you enter and cannot adjust for early birth.
- Expecting a smooth change from one day to the next. The bands jump at fixed ages, so 12.9 months gives 150–240 min and 13 months gives 240–330 min.
- Entering an age above 36 months for an older child and expecting an extrapolated value. The table stops at 36 months and gives no result beyond it.
About this calculator
A wake window is the stretch of time a baby or toddler can comfortably stay awake between one sleep period and the next before overtiredness sets in and makes falling asleep harder rather than easier. Wake windows grow steadily with age: a newborn may only manage 45 to 60 minutes before needing to sleep again, while a toddler approaching preschool age can often stay awake for four to six hours between naps.
Parents and caregivers who follow baby-sleep guidance from sources like the Baby Sleep Site or Taking Cara Babies use age-based wake windows to time naps and bedtime before a baby crosses from tired into overtired, since an overtired baby typically fights sleep, wakes more during the night, and is harder to settle than one put down at the right moment. Daycare and nursery staff use the same age brackets to plan group nap schedules.
Enter your child's age in months and the calculator returns the wake window that is typical for that age, helping you time naps before overtiredness kicks in.
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