Baby care · Sleep

Newborn Sleep Schedule Calculator

Enter your baby's age to see typical total sleep, day vs. night split, number of naps and the wake window between sleeps. Aligned with AAP and National Sleep Foundation guidance.

Last reviewed 22 May 2026

Newborn & infant sleep schedule

How much sleep does my baby need?

3–4 months
13–16 h total / 24 h

The 4-month sleep regression often arrives here as sleep cycles mature. Stay consistent.

Night sleep
8.5–12.5 h
Longest stretch.
Day naps
3.5–4.5 h
3–4 naps
Wake window
1 h 15 m–1 h 45 m
Awake time between sleeps.
What does this mean?
Wake windows — the awake stretch between sleeps — are the most reliable signal for when to put your baby down. Newborns can only stay awake 45-60 min; by 3 months wake windows lengthen to ~90 min; by 12 months ~3-4 h. Pushing past the wake window leads to an overtired baby (cortisol spike), making it harder to settle. Total sleep needs vary by child within the National Sleep Foundation ranges. Drop-from-nap signals are typically slow morning fights to fall asleep. Safe-sleep ABC (AAP 2022): Alone, on Back, in a Cot — firm flat surface, no bumpers, no soft bedding, room-share but not bed-share until 12 months.

How to use this calculator

Enter your baby’s age in months (the more common unit) or weeks for younger babies. The calculator picks the matching age band and shows the typical:

  • Total sleep per 24 hours.
  • Daytime nap total and number of naps.
  • Wake window — the awake stretch between sleeps that most babies tolerate well at this age.
  • A short note on what to expect at this stage (e.g. the 4-month regression, transitions, common pitfalls).

Background — the developing sleep cycle

Newborns don’t have a circadian rhythm yet — that 24-hour clock emerges from a combination of melatonin maturation and exposure to light, dark and feeding cues, usually consolidating between 8 and 12 weeks. Sleep cycles also change: a newborn cycle is about 50 minutes and includes a lot of active (REM-like) sleep; by ~4 months cycles lengthen and add deeper non-REM stages, which is why the famous “4-month regression” appears as sleep momentarily becomes more fragmented.

Wake windows are the easiest practical guide. A baby kept awake well past the wake window for their age becomes overtired — cortisol rises, falling asleep gets harder, and the next sleep is shorter and more fragmented.

Interpreting your result

Ranges, not single numbers. A baby at the low end of the range who is feeding well, growing along their curve and content awake is sleeping enough. A baby below the range who is also fussy, not growing, or struggling to feed needs assessment by a clinician.

Day-night balance matters: babies who get too much day sleep (more than the upper end of the day-nap range) often wake more at night. Capping the late-afternoon nap and protecting a calm, repeatable bedtime routine are the two highest-leverage moves once the circadian rhythm is in place.

Limitations

  • Ranges are guidance, not prescription. Healthy babies can sit a little above or below the range — what matters is the overall trend and the baby’s mood when awake.
  • Premature babies should be tracked by adjusted (corrected) age until ~2 years, not chronological age.
  • Medical conditions — reflux, allergies, ear infections, obstructive sleep apnea — can change sleep patterns. Talk to a paediatrician if sleep is sharply off the expected range.
  • This is an educational tool. Always follow AAP safe-sleep guidance: alone, on the back, in a crib or bassinet.

Sources

  • American Academy of Pediatrics. Sleep-related infant deaths: updated 2022 recommendations for reducing infant deaths in the sleep environment.
  • Paruthi S, Brooks LJ, D’Ambrosio C, et al. Recommended amount of sleep for pediatric populations: a consensus statement of the American Academy of Sleep Medicine. J Clin Sleep Med 2016;12(6):785-86.
  • Hirshkowitz M, Whiton K, Albert SM, et al. National Sleep Foundation’s sleep time duration recommendations. Sleep Health 2015;1(1):40-43.
  • Galland BC, Taylor BJ, Elder DE, Herbison P. Normal sleep patterns in infants and children: a systematic review of observational studies. Sleep Med Rev 2012;16(3):213-22.

Frequently asked questions

How much sleep does a newborn really need?
Most newborns sleep about 14–17 hours in a 24-hour day, but the sleep is fragmented into short stretches of 2–4 hours. Day-night rhythm doesn't establish until roughly 8–12 weeks of age, so a baby who is feeding well and stooling normally is usually fine even if the day/night pattern looks chaotic.
What is a 'wake window'?
A wake window is the amount of time your baby is comfortably awake between sleeps. Going meaningfully past the wake window for an age tends to produce an overtired baby who is harder to settle and wakes more during the next sleep. Wake windows lengthen with age — from 45–60 minutes in the newborn period to 4–5 hours by age 2.
When do babies start sleeping through the night?
There is huge variation. Many babies will manage a 5–6 hour stretch around 3–4 months; longer stretches of 8+ hours often arrive between 6 and 9 months. Night feeds may still be developmentally normal up to a year, especially for breastfed babies. 'Sleeping through' isn't a strict milestone — patterns shift around teething, illness, growth spurts and developmental leaps.
How do I move from 3 naps to 2, or 2 naps to 1?
Watch the wake windows. When your baby can comfortably stay awake longer than the current schedule allows and the last nap of the day is shrinking or getting refused, it's usually time to drop a nap. Most babies drop to 2 naps around 6–9 months and to 1 nap around 13–16 months. Allow a couple of weeks of slightly earlier bedtime through the transition.
What about safe-sleep practice?
Always follow the safe-sleep ABCs (Alone, on the Back, in a Crib or bassinet) until 12 months. Use a firm flat sleep surface, no soft bedding, bumpers, weighted sleepers or inclined sleepers. Room-share without bed-sharing for at least the first 6 months. See the BumpBites safe-sleep guide for the full checklist.

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