4 Month Old Sleep Schedule

If last month felt like you were finally getting the hang of it, and this month feels like starting over, that is not you. Around four months a baby's sleep matures from the newborn pattern into lighter, adult-like sleep cycles. The upside is a baby who can stay awake longer and settle into a more predictable day. The cost is a few weeks where naps get short and nights get choppier.

A schedule at this age is less a timetable and more a set of guard rails: how long your baby can comfortably stay awake, roughly how many naps fit in a day, and when bedtime should land. Get those three right and most of the rest follows.

4 Month Sleep at a Glance

The total-sleep range comes from the American Academy of Sleep Medicine consensus for babies aged 4 to 12 months, which the American Academy of Pediatrics endorses. It is wide on purpose. A baby who sleeps 12.5 hours and wakes happy is getting enough.

Wake Windows at 4 Months

A wake window is the stretch from when your baby wakes up to when they are asleep again. At four months it usually sits between 1 hour 15 minutes and 2 hours 15 minutes. That is the exact range the Hushly app starts from for a 4-month-old (corrected age, if your baby was born early) before it learns your own baby's rhythm.

Wake windows are not flat through the day. They stretch as the day goes on:

• First window of the day: the shortest, often 1h15 to 1h30. Many 4-month-olds are ready for a nap surprisingly soon after a full night.
• Middle windows: 1h30 to 2h.
• Last window before bed: the longest, up to about 2h15.

If your baby fights every nap, try a slightly longer window for a few days. If they melt down well before the nap and then wake after 30 minutes, the window is probably too long. Our guide to the overtired second wind covers what that looks like.

Sample 4-Month Schedules

These assume a 07:00 wake-up. Shift every time by the same amount if your morning starts earlier or later. Times are when your baby is asleep, not when you start the routine, so begin winding down 10 to 15 minutes before.

4-nap day

3-nap day

Notice what happens on the 3-nap day: with naps a bit longer and windows a bit longer, bedtime still lands earlier, at 18:15. That is normal during the 4-to-3 transition. An early bedtime on a 3-nap day protects the night; a late fourth nap to push bedtime back often backfires.

Why Naps Are Short Right Now

A sleep cycle at this age lasts roughly 30 to 50 minutes. Newborns drift from one cycle into the next without fully waking. After the four-month shift, many babies surface completely at the end of a single cycle, look around, and decide the nap is over. That is why so many 4-month naps end at 30 to 45 minutes on the dot.

It is a developmental stage, not a sign you are doing something wrong. A few things help:

• Give it a few minutes. If your baby wakes at 35 minutes but is not crying hard, wait 5 to 10 minutes before going in. Some will drift back into a second cycle.
• Protect one long nap. The middle-of-the-day nap is usually the easiest to stretch. A dark room and white noise make the most difference here.
• Use the short naps. Several short naps still add up. Count the day's total rather than judging each nap.

Our full guide to short naps goes deeper, and the 4-month regression guide explains what is changing in the brain.

Nights at 4 Months

Most 4-month-olds still wake to feed once to three times a night, and that is expected. The first stretch after bedtime is often the longest, commonly two and a half to four hours, and the stretches get shorter toward morning.

What changes now is that some wakings stop being about hunger. A baby who has learned to fall asleep only while feeding or being rocked may need the same help every time they surface between cycles. You do not have to change anything about that. If you want to, four months is the earliest age most pediatric sleep experts suggest starting gentle changes, and our guide to sleep training at 4 months walks through the options. Night feeds are a separate question for your pediatrician, based on weight gain.

Rolling and the Swaddle

Many babies start trying to roll around four months. The American Academy of Pediatrics advises stopping the swaddle as soon as your baby shows signs of trying to roll, because a swaddled baby who rolls onto their tummy cannot push up or roll back. A wearable sleeping bag with free arms is the usual next step, and our swaddling guide covers the switch.

Always put your baby down on their back, on a firm flat surface, with nothing loose in the crib. If your baby rolls over on their own once they can roll both ways, you do not need to keep turning them back.

How Hushly Uses These Numbers

The ranges on this page are the starting point the Hushly app uses for a 4-month-old. After about six logged naps it begins shifting them toward what your baby actually does, so a baby who reliably manages 1h45 in the morning gets a later first window than one who is done after 1h15. It also notices 4-nap and 3-nap days and moves bedtime earlier on 3-nap days, the same way the sample schedules above do.

Sources

• Paruthi S, et al. Recommended Amount of Sleep for Pediatric Populations: A Consensus Statement of the American Academy of Sleep Medicine. Journal of Clinical Sleep Medicine, 2016;12(6):785-786.
• Moon RY, et al. Sleep-Related Infant Deaths: Updated 2022 Recommendations for Reducing Infant Deaths in the Sleep Environment. Pediatrics, 2022;150(1):e2022057990.
• NHS: Helping your baby to sleep

Let the schedule come to you

Hushly starts from the 4-month ranges on this page and adjusts to your baby after a handful of logged naps, so you see when the next nap window opens instead of doing the math at 6 a.m. Free to download.

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Sleep schedules by age

Want today's plan for your own baby? The free baby sleep calculator turns age and wake-up time into naps and a bedtime.

• 4 Month Old Sleep Schedule (this guide)
• 5 Month Old Sleep Schedule: Three naps, the late-afternoon catnap, and what to do about 5 a.m. starts.
• 6 Month Old Sleep Schedule: Three naps or two, a schedule for each, and what solids and teething really do to sleep.
• 7 Month Old Sleep Schedule: The month most babies move to two naps: why the third stops fitting, and a schedule for each.
• 8 Month Old Sleep Schedule: A steady 2-nap day, the longest wake windows yet, and nights with standing and crawling in the mix.