What is a wake window?

A wake window is the amount of time a baby can comfortably stay awake between sleep periods before becoming overtired. Wake windows increase as babies grow — newborns can only manage around 60 minutes, while a 12-month-old may handle 3 hours. Keeping within age-appropriate wake windows helps babies fall asleep more easily and sleep more soundly, because overtired babies often become harder to settle and sleep more briefly.

My baby refuses to nap — what should I do?

Occasional nap refusals are normal, especially during developmental leaps, illness, or when the schedule needs adjusting for a growth stage. Try these general tips: put baby down drowsy but awake; keep the sleep environment dark and quiet; use a consistent pre-nap routine (e.g. feed, change, a short song). If nap refusals are persistent or accompanied by signs of discomfort, it is worth discussing with a paediatrician, as ear infections or other health issues can affect sleep.

When should I adjust the schedule as my baby gets older?

The main nap transition milestones to watch for are: around 3–4 months (5 naps → 4), around 6 months (4 → 3), around 9 months (3 → 2), and around 15–18 months (2 → 1). Signs that a transition is due include consistently fighting naps, taking much longer to fall asleep, or waking very early in the morning. Transitions often take 1–4 weeks to settle. During that time, an "emergency nap" capped at 20–30 minutes can bridge a bad day without disrupting the new schedule.

Baby Sleep Schedule Calculator

Baby's Information

Age (months, 0–24)

Today's wake-up time

Save age and wake-up time in this browser for next visit. (Optional. Data stays on your device — never sent to any server.)

About This Tool

Enter your baby's age and today's wake-up time to get a recommended nap schedule and bedtime — based on age-appropriate wake windows and nap durations. For general reference only; always consult a paediatrician for individual sleep concerns.

This calculator suggests a nap schedule and bedtime based on age-appropriate wake windows and nap durations, drawing on general recommendations from sources such as the American Academy of Sleep Medicine (AASM) and the National Sleep Foundation (NSF). Every baby is unique — the schedule is a starting point, not a prescription.

How To Use

Enter your baby's age in months (0–24) — the recommended number of naps and wake windows are automatically set based on the age range.
Enter today's wake-up time — the first nap is scheduled at wake-up time + the age-appropriate wake window.
Optionally, enter when the last nap ended — if your baby has already napped, the remaining naps and bedtime are recalculated from that point forward.
Click Calculate Sleep Schedule— today's nap timeline, individual nap start/end times, and recommended bedtime are displayed.

Example: Nap Patterns by Age

Age	Naps/day	Wake window	Nap duration
0–2 months	5	~1 hr	~45 min
3–5 months	4	~1.5 hr	~1 hr
6–8 months	3	~2 hr	~1.25 hr
9–12 months	2	~3 hr	~1.5 hr
13–17 months	1–2	~3.5 hr	~1.5 hr
18–24 months	1	~4 hr	~1.5 hr

Based on general recommendations from the American Academy of Sleep Medicine (AASM), the National Sleep Foundation (NSF), and paediatric sleep literature. Individual variation is significant — use as a reference only.

Frequently Asked Questions

What is a wake window?: A wake window is the amount of time a baby can comfortably stay awake between sleep periods before becoming overtired. Wake windows increase as babies grow — newborns can only manage around 60 minutes, while a 12-month-old may handle 3 hours. Keeping within age-appropriate wake windows helps babies fall asleep more easily and sleep more soundly, because overtired babies often become harder to settle and sleep more briefly.
My baby refuses to nap — what should I do?: Occasional nap refusals are normal, especially during developmental leaps, illness, or when the schedule needs adjusting for a growth stage. Try these general tips: put baby down drowsy but awake; keep the sleep environment dark and quiet; use a consistent pre-nap routine (e.g. feed, change, a short song). If nap refusals are persistent or accompanied by signs of discomfort, it is worth discussing with a paediatrician, as ear infections or other health issues can affect sleep.
When should I adjust the schedule as my baby gets older?: The main nap transition milestones to watch for are: around 3–4 months (5 naps → 4), around 6 months (4 → 3), around 9 months (3 → 2), and around 15–18 months (2 → 1). Signs that a transition is due include consistently fighting naps, taking much longer to fall asleep, or waking very early in the morning. Transitions often take 1–4 weeks to settle. During that time, an "emergency nap" capped at 20–30 minutes can bridge a bad day without disrupting the new schedule.

This calculator is for informational purposes only and does not constitute medical advice. Results are estimates based on general formulas. Always consult a qualified healthcare professional for health-related decisions.

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