Wake Window Calculator
Enter your baby's age in months and get the typical wake window range, how many naps a day that age usually takes, and total daily sleep expectations — the three numbers sleep schedules are built on.
Sleep-site tables often present one magic number per age. This one shows honest ranges, because a 4-month-old's comfortable window varies by half an hour baby to baby — and reading cues beats watching the clock anyway.
How to use
- Enter your baby's age in months (use the corrected age if born early).
- Read the wake window range: aim naps at the lower end on busy days, the upper end is a ceiling, not a target.
- Watch for the cues — eye rubbing, staring, fussing — and put the baby down at the first one rather than waiting out the window.
Frequently asked questions
What happens if I miss the wake window?
Overtiredness releases cortisol, which works like caffeine: the baby fights the next nap, sleeps shorter and wakes more at night. An earlier bedtime by 20-30 minutes usually rescues the day.
Do wake windows apply at night?
They set the last stretch before bed: the final wake window is usually the longest of the day, around 2-3 hours at 6 months. If nights are rough, shorten the day's last window first before changing anything else.
What is the 2-3-4 schedule?
A simple pattern once naps consolidate to two: wake window of 2 hours before the first nap, 3 before the second, 4 before bedtime. It works for many babies aged roughly 6-14 months and self-adjusts as windows stretch.
Are these ranges rules?
No — they are population mid-points. Premature babies run on corrected age, high-need sleepers run short, and some babies comfortably run long. Consistency day to day matters more than hitting a specific number.