Wake Windows Calculator
Enter your child's age and this morning's wake-up time. We'll map out today's ideal nap times and bedtime using age-appropriate wake windows — the same engine that powers our personalized 14-day sleep plans.
Wake windows by age: quick reference
Wake windows stretch fast in the first two years — from under an hour as a newborn to 5-6 hours as a toddler. Tap any age for a full guide with sample schedules.
| Age | Wake windows | Naps | Bedtime |
|---|---|---|---|
| Newborn (0–4 Weeks) | 45–60 minutes | 4–6 naps | 8:00–10:00 PM |
| 1 Month Old | 45–75 minutes | 4–5 naps | 8:00–10:00 PM |
| 2 Months Old | 45–90 minutes | 4–5 naps | 8:00–9:30 PM |
| 3 Months Old | 1–1.75 hours | 3–4 naps | 7:30–9:00 PM |
| 4 Months Old | 1.5–2.25 hours | 3–4 naps | 7:00–8:00 PM |
| 5 Months Old | 1.75–2.5 hours | 3 naps | 7:00–8:00 PM |
| 6 Months Old | 2–3 hours | 3 naps | 7:00–8:00 PM |
| 7 Months Old | 2.25–3 hours | 2–3 naps | 7:00–8:00 PM |
| 8 Months Old | 2.5–3.5 hours | 2 naps | 6:30–7:30 PM |
| 9 Months Old | 2.5–3.5 hours | 2 naps | 7:00–8:00 PM |
| 10 Months Old | 3–3.5 hours | 2 naps | 7:00–8:00 PM |
| 11 Months Old | 3–3.75 hours | 2 naps | 7:00–8:00 PM |
| 12 Months Old | 3–4 hours | 2 naps | 7:00–8:00 PM |
| 15 Months Old | 3.25–5.5 hours | 1–2 naps | 7:00–8:00 PM |
| 18 Months Old | 4–6 hours | 1 nap | 7:00–8:00 PM |
| 2 Years Old | 5–6 hours | 1 nap | 7:30–8:30 PM |
| 3 Years Old | 6+ hours | 0–1 nap | 7:30–8:30 PM |
See the full wake windows by age guide or jump to the bedtime calculator.
Frequently Asked Questions
What are wake windows?
A wake window is the length of time a baby can comfortably stay awake between sleeps. Age-appropriate wake windows help prevent both overtiredness (too long awake) and undertiredness (too short awake), which are the two most common causes of nap battles and night wakings.
How does this wake windows calculator work?
It takes your child's age and this morning's wake-up time, then spaces naps through the day using age-appropriate wake windows — shortest before the first nap, longest before bedtime — and calculates tonight's target bedtime.
Should I follow wake windows exactly to the minute?
No — wake windows are a starting range, not a stopwatch. Combine the clock with your child's sleepy cues (yawning, eye rubbing, zoning out, fussiness). If your baby fights sleep, try adding 10-15 minutes of awake time; if they melt down before nap time, shorten the window.
Why is my baby fighting naps even with correct wake windows?
The most common reasons: the wake window has recently lengthened (they may be ready for more awake time or a nap transition), the sleep environment is too stimulating, or they rely on being fed or rocked to fall asleep. Our free quiz can pinpoint which one applies to your child.
What ages does this calculator cover?
From newborn to 3 years. After age 3-4, most children stop napping entirely, and a consistent bedtime matters more than wake windows — see our bedtime calculator for that.