Your Suggested Day
| Event | Time |
|---|
- A wake window is how long your baby can comfortably stay awake before needing sleep again — it lengthens steadily with age
- This calculator uses age-based wake window guidance, consistent with ranges cited by the American Academy of Pediatrics and the American Academy of Sleep Medicine
- The World Health Organization recommends 14–17 total sleep hours per day at 0–3 months, 12–16 hours at 4–11 months, 11–14 hours at 1–2 years, and 10–13 hours at 3–4 years
- Nap count typically drops from 4–5 naps as a newborn to 0 naps for most children by age 3–5
- An overtired baby is often harder to settle, not easier — timing matters more than most parents expect
- Every baby is different — use the result as a flexible starting point, not a strict rule
How This Calculator Works
The calculator uses "wake windows" — the typical stretch of time a baby can comfortably stay awake before needing sleep again — for your baby's age. Starting from their wake-up time, it adds the appropriate wake window before each nap and before bedtime, using the nap length you enter, to build the full suggested day.
Nap count and average nap length are pre-filled with common defaults for your baby's age, but you can adjust either one — many babies don't follow the average exactly, and that's completely normal. The wake-window pattern used here reflects general guidance from the American Academy of Pediatrics (AAP) and the American Academy of Sleep Medicine (AASM) on typical infant and toddler sleep timing.
| Age | WHO Total Sleep, per 24h |
|---|---|
| 0–3 months | 14–17 hours |
| 4–11 months | 12–16 hours |
| 1–2 years | 11–14 hours |
| 3–4 years | 10–13 hours |
Source: World Health Organization, Guidelines on physical activity, sedentary behaviour and sleep for children under 5 years of age (2019).
Why Wake Window Timing Matters
Getting the timing right matters because both extremes cause problems. A wake window that runs too long leads to an overtired baby with elevated stress hormones that can make falling asleep harder, not easier. A window that's too short can mean a baby isn't tired enough yet and resists settling.
- Rubbing eyes or pulling at ears
- Arching the back or becoming stiff
- Increased fussiness or crying
- A "second wind" of hyperactive energy right before a meltdown
- Resists falling asleep despite a calm routine
- Takes a long time to settle for a nap
- Naps are consistently short (under 30–40 minutes)
- Still seems bright and playful right up to nap time
Wake Window Reference Chart, Birth to Five
For reference, here are the typical wake window ranges the calculator draws from, alongside common nap counts at each stage.
| Age | Typical Wake Window | Typical Naps |
|---|---|---|
| Newborn (0–6 weeks) | 45–60 min | 4+ naps |
| 6–12 weeks | 1–1.5 hrs | 4 naps |
| 3–4 months | 1.25–2 hrs | 3–4 naps |
| 5–6 months | 2–2.75 hrs | 3 naps |
| 7–9 months | 2.5–3.5 hrs | 2 naps |
| 10–12 months | 3–4 hrs | 2 naps |
| 13–18 months | 4–5 hrs | 1–2 naps |
| 19–24 months | 5–6 hrs | 1 nap |
| 2–3 years | 5–6 hrs | 1 nap |
| 3–4 years | 6–7 hrs | 1 nap, fading |
| 4–5 years | 7–8 hrs | 0 naps, most children |
For a fuller walkthrough of sleep at every age, see our complete baby sleep guide.
Common Wake Window Mistakes
⏱️ Following the number too rigidly
What happens: Treating the wake window as an exact countdown rather than a range can mean missing your baby's actual sleepy cues.
What helps- Use the range as a guide, then watch for cues in the last 15–20 minutes
- Start the wind-down routine slightly before the window ends
📈 Not adjusting after a growth spurt or regression
What happens: A wake window that worked well last week can suddenly feel too long during a growth spurt or regression.
What helps- Try 15–30 minutes shorter for a few days if things feel off
- Expect this to be temporary — it usually settles within a week or two
🌅 Forgetting the first window is shorter
What happens: The first wake window after waking for the day is typically the shortest of the day, since overnight sleep pressure has just been cleared.
What helps- Aim for the shorter end of the range first thing in the morning
- Let later windows in the day run a little longer
Beyond a One-Time Calculation
A calculator gives you a starting estimate for today. Lunara's sleep tracker logs your baby's actual naps and night sleep as they happen, then compares the real pattern against typical wake windows for their age automatically — so you get an updated, personalized picture over time, not just a single snapshot.
Log actual sleep —
and let Lunara track wake windows automatically.
No more manual calculating. Log a wake-up and Lunara shows the ideal next nap window for your child's age, updated as they grow. Free to start.
Frequently Asked Questions
Enter your baby's age, their usual wake-up time, how many naps they take, and roughly how long each nap lasts. The calculator uses age-appropriate wake windows to work out when each nap and bedtime should fall, then displays the full suggested day.
This tool provides guideline times based on common wake windows for your baby's age — it's a helpful starting point, not an exact prescription. Every baby is a little different, so use the schedule as a flexible guide and follow your baby's own sleepy cues alongside it.
Nap count typically drops from around 4–5 short naps as a newborn to 3 naps by around 5–6 months, 2 naps by 7–9 months, 1 nap from around 14–18 months, and 0 naps for most children by age 3–5. The calculator suggests a starting nap count for your baby's age, which you can adjust.
That's normal — the calculator shows a general guideline, and real schedules shift around growth spurts, regressions, illness, and everyday life. If your baby is generally well-rested, growing well, and in good spirits, their own pattern is likely working fine even if it doesn't match exactly.
Yes, though newborn sleep is naturally less predictable than older babies' — expect the suggested schedule to shift day to day in the first few months as your baby's own rhythm develops.
No — this calculator runs entirely in your browser and doesn't save, store, or send your inputs anywhere. If you want to track your baby's actual sleep over time rather than a one-off calculation, Lunara's sleep tracker does that automatically.
The World Health Organization's 2019 guidelines recommend 14–17 hours of total sleep per 24 hours for babies 0–3 months, 12–16 hours for 4–11 months, 11–14 hours for 1–2 years, and 10–13 hours for 3–4 years. WHO's guidance covers total sleep duration only — it does not specify nap counts, wake windows, or exact bedtimes, which is why this calculator draws on separate AAP- and AASM-consistent guidance for scheduling.
Lunara logs your baby's actual naps and night sleep as they happen, then compares the real pattern against typical wake windows for their age automatically — so you get an updated, personalized picture over time instead of a single calculation. It's free to start.
Read the complete baby sleep guide · Newborn sleep schedule · Baby keeps waking