Wake Window Calculator
Enter your baby's age to see the wake window that's typical for them right now — the awake time between sleeps — plus a suggested nap rhythm for the rest of the day. Ranges are a gentle guide; your baby's tired cues always win.
How it works
- Enter your baby's age in weeks or months.
- Optionally enter the time they last woke up to get suggested sleep times.
- See the typical wake-window range for their age and a shortest-first day rhythm.
- Use it as a heads-up for when to start watching for tired cues — then follow the cues, not the clock.
Related reading
Wake windows: how long awake between sleeps
The full guide to wake windows and tired cues.
Baby sleep
Naps, night wakings, regressions and gentle routines.
Cocoon works this out from your logs automatically
Log feeds, sleep and growth in seconds and Cocoon surfaces wake windows, feeding rhythm and WHO/CDC percentiles for you — free, offline-first, no subscription.
Common questions
What is a wake window?
A wake window is the length of time a baby is happily awake between one sleep and the next — including the feed, nappy change and play. It starts when they wake and ends when they fall asleep again.
How long should my baby be awake?
Typical wake windows grow with age: roughly 30–60 minutes for a newborn, 1–1.5 hours around 2–3 months, about 2 hours by 4–6 months, and 3–4 hours near a year. These are broad guides — watch your baby's tired cues.
Why is the first wake window the shortest?
Sleep pressure is lowest right after a long night, so most babies can only stay happily awake for a short stretch first thing. Each window then tends to lengthen across the day, with the longest before bedtime.
Is this a substitute for following my baby's cues?
No. Wake windows are a rough heads-up for when to start watching. Tired signs — slowing down, staring, yawning, fussing — are far more reliable than any number, and you should always follow them.
This tool gives typical ranges for general information only. Every baby is different — it is not medical advice and not a medical device. For anything about your baby's health, growth or feeding, talk with your doctor or child-health nurse.