Month-by-month sleep guide
4-Month-Old Sleep Schedule
- ⏰ Wake window: 1.5–2 hours
- 🍼 Naps per day: 4
- 🌙 Bedtime: 8:45 PM
- 😴 Total sleep: 13–15 hours
Reviewed by the BabyNapCalc Editorial Team — our content is reviewed for accuracy against pediatric sleep guidance (AAP/NSF). This is general information, not medical advice.
Four months is the most talked-about month in baby sleep — and for good reason. Around now, your baby's sleep cycles permanently mature from newborn patterns to adult-like cycles, triggering the notorious 4-month sleep regression: shorter naps, more night wakings, and a baby who suddenly seems to have forgotten how to sleep. The good news: wake windows of 1.5–2 hours and a predictable 4-nap rhythm give you a framework to ride it out.
4-month-old sleep at a glance
Typical ranges for 4 months — every baby is different, so treat these as a starting point.
1.5–2 h
Between sleep periods
Shorter during the regression
4
4 naps (3–4 during regression)
Catnaps are common now
13–15 h
Naps + night combined
Typical for this age
Sample 4-month-old schedule
An example day with a 7:00 AM wake, built from this month’s midpoint wake windows. Use the mini calculator above with your real wake time.
8:45 AM – 10:00 AM
Nap 1
About 75 minutes
11:45 AM – 1:00 PM
Nap 2
About 75 minutes
2:45 PM – 4:00 PM
Nap 3
About 75 minutes
5:45 PM – 7:00 PM
Nap 4
About 75 minutes
8:45 PM
Bedtime
End of the day
Surviving the 4-month sleep regression
The 4-month mark is famous for one reason: sleep often gets worse before it gets much, much better. Around now your baby's brain permanently upgrades to adult-like sleep cycles — a developmental leap disguised as a regression. Wake windows of 1.5–2 hours, 4 naps a day, and 13–15 hours of total sleep give you the structure to get through it.
The 4-month sleep regression, explained
This isn't a true regression — it's a permanent upgrade. Your baby starts cycling between light and deep sleep like an adult, which means brief awakenings between every 60–90 minute cycle. Babies who were “good sleepers” suddenly wake fully at each transition and need help resettling. It typically lasts 1–2 weeks (sometimes up to a month) and resolves on its own — the best strategy is consistency: same wake time, same bedtime window, same soothing, every day. During the worst of it, many babies temporarily fit only 3–4 naps because everything is choppier.
Wake windows of 1.5–2 hours
Outside the regression, a 4-month-old handles about an hour and a half to two hours awake. The first window is usually shortest (around 1.5 hours) and the last longest (around 2 hours). Because naps often shrink to 30–45 minutes during the regression, the day can feel like constant motion — that's normal and temporary. Our nap calculator can help you space the day's naps so overtiredness doesn't snowball.
Rolling over changes the crib
Many 4-month-olds roll this month, and some start practicing in the crib at 2 AM. Two safety notes: once your baby shows signs of rolling, stop swaddling and switch to a sleep sack, and always still place them down on their back — it's fine if they roll themselves over. Extra daytime rolling practice usually reduces the midnight gymnastics within a few days. Drooling ramps up too, though teeth are usually still months away.
Bedtime moves earlier
With 4 naps and 1.5–2 hour windows, bedtime naturally lands around 7–8 PM for a 7 AM wake-up. An early bedtime is your best defense during the regression — a well-rested baby learns the new sleep cycles faster than an overtired one. The baby bedtime calculator can pin down the right window from your wake time. Once the regression passes, many families find this is the sweet spot to start a consistent bedtime routine. Next: the 5-month-old sleep schedule.
4-month-old sleep questions, answered
Quick answers to the questions parents ask most about sleep at 4 months.
What is the 4-month sleep regression?
Around 4 months, babies' sleep cycles permanently mature to adult-like patterns, causing brief awakenings between cycles. Sleep often gets choppier for 1–2 weeks (sometimes longer) before settling into the new, more mature pattern.
How long does the 4-month sleep regression last?
Typically 1–2 weeks, occasionally up to a month. Consistency — same wake time, bedtime window, and soothing approach — helps babies adjust fastest.
How many naps does a 4-month-old need?
Usually 4 naps. During the regression, naps often shorten to 30–45 minutes; some days only 3 naps fit, and that's okay temporarily.
Is it safe if my 4-month-old rolls over in the crib?
Always place your baby on their back to sleep, but you don't need to flip them back if they roll themselves over. Stop swaddling as soon as rolling begins and switch to a sleep sack.
This page is a planning guide based on general pediatric sleep guidance, not medical advice. Every baby is different — talk to your pediatrician with concerns about your baby’s sleep.