Wake Window Calculator by Age

Short naps (known as catnaps) are very common, especially before 4 months. Babies have a sleep cycle of around 45 minutes and many wake between cycles rather than linking them. This is developmentally normal. After 4 months, you can try: capping the morning nap to encourage longer afternoon naps, making the nap environment darker and quieter, or using white noise. Some babies remain catnappers throughout the nap phase — provided total sleep is adequate, this is not a problem.

Most babies drop from two naps to one between 14 and 18 months, though some do so as early as 12 months or as late as 24 months. Signs of readiness include: consistently taking a long time to fall asleep for one nap, fighting one nap regularly, or sleeping well on one nap days. The transition period can take 4–8 weeks and often involves some overtiredness while the new routine establishes.

Overtired signs: fighting sleep despite obvious tiredness, taking a long time to fall asleep, very fussy and hard to settle, waking frequently after falling asleep. Undertired signs: playing happily at sleep time, lying awake but content, short nap then alert and happy. If your baby is overtired, try moving the next sleep earlier by 15–20 minutes. If undertired, try extending the wake window slightly.

Yes — wake windows are based on neurological development rather than feeding method, so the same ranges apply regardless of how your baby is fed. However, newborn breastfed babies may feed very frequently (every 1–2 hours) which naturally structures wake time around feeds. As they get older and feeds consolidate, wake windows become easier to track independently of feeding.