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About this tool
Build a nap and bedtime schedule from age-based awake windows, nap counts and total sleep needs for babies and toddlers.
The Baby Wake Window Planner turns a baby's age, morning wake time and target bedtime into a full nap schedule by solving span = naps x nap length + (naps + 1) x wake window, then choosing the nap count whose required awake stretch sits closest to the middle of the age-appropriate range. It is built for parents and carers of children up to 36 months who want the day to actually end at the bedtime they picked. Nap length is derived rather than guessed: total daily sleep for the age (AASM consensus ranges from 4 months, National Sleep Foundation below that) minus the typical overnight portion, divided across the naps.
Open Baby Wake Window Planner on AltFTool — it loads instantly in your browser.
Add your input to the workspace.
Adjust the options until the result looks right.
Copy or download the output and put it to work.
Most wake-window charts fix the window and let bedtime land wherever it falls; this works backwards from your target bedtime and tells you the window that reaches it.
It tests every plausible nap count for the age band, prefers the ones whose required window lands inside the published range, and breaks ties by closeness to the range midpoint.
If the required window is shorter or longer than the age range, or the bedtime falls outside the usual 17:30 to 20:30 span, the plan says so instead of quietly producing an unrealistic schedule.
A wake window is the stretch a baby can stay comfortably awake between sleeps. The planner uses ranges from common paediatric sleep practice that widen with age: roughly 45 to 60 minutes at 0 to 1 month, 105 to 150 minutes at 4 to 6 months, 180 to 240 minutes at 9 to 12 months, and 300 to 420 minutes at 2 to 3 years.
The planner uses 12 to 16 hours for 4 to 12 months and 11 to 14 hours for 1 to 2 years, which are the AASM consensus recommendations endorsed by the AAP. Below 4 months the AASM declined to issue a recommendation, so the National Sleep Foundation newborn range of 14 to 17 hours is used instead.
That message means the daytime sleep the age needs is longer than the gap you left between waking and bedtime, so no positive wake window exists. Move bedtime later or the wake time earlier. The planner also rejects days under 4 hours or over 16 hours from wake to bedtime as input errors.
No — it is an informational planner built on published age ranges, not a medical assessment of your child. Every baby varies, and sleep problems, unusual sleep totals, or concerns about growth and feeding should go to your paediatrician or health visitor.