A wake window is how long a baby can comfortably stay awake between sleeps. Choose your baby's age and the time they woke up, and the calculator suggests a window for the next nap — before overtiredness makes settling harder.
General information from online sources, not written by a doctor and not a substitute for individual medical advice. Recommendations may differ by country; ask your care team about your baby.
Typical wake windows by age
| Age | Typical wake window |
|---|---|
| 0–4 weeks | 45–60 minutes |
| 1–3 months | 1–1.5 hours |
| 4–6 months | 1.5–2.5 hours |
| 6–9 months | 2–3 hours |
| 9–12 months | 3–4 hours |
| 1–2 years | 4–6 hours |
These ranges match our baby sleep chart by age. They are averages: the first wake window of the day is often the shortest and the one before bedtime the longest.
Watch your baby's sleepy cues
Use the time as a guide and your baby's signals as the decider: yawning, staring, rubbing eyes or ears, turning away and fussiness mean it's time to wind down. If naps are a struggle, read why babies don't sleep at night and the 4-month sleep regression.
Safe sleep always: on the back, on a firm flat mattress, with no pillows or loose bedding. Talk to your pediatrician if your baby is unusually sleepy and hard to wake, snores loudly or pauses breathing.
Let the app learn your baby's rhythm
Log naps in the baby tracker app Trackeron and see daily and weekly sleep charts — so you can spot your baby's real wake windows, not just averages.
Track every nap in one tap
Start and stop sleep timers, see sleep charts, and share the log with everyone who puts your baby down. Free to download.
Frequently asked questions
What is a wake window?
The time a baby spends awake between two sleeps. It grows from about 45–60 minutes in newborns to 4–6 hours between 1 and 2 years.
Should I wake my baby from a nap?
Very long daytime naps can affect night sleep. Many parents gently wake a baby after about 2–3 hours of daytime sleep, but follow your baby and your pediatrician's advice, especially with newborns who need regular feeds.
Why does my baby fight naps?
Common reasons are being under-tired (wake window too short), overtired (too long), hungry, or going through a developmental leap.
Is the calculator accurate for every baby?
No — it uses average ranges. Watch your baby's sleepy cues and adjust by 15–30 minutes as needed.
Is my data stored?
No. The calculation runs only in your browser.