Your baby used to give you a solid five- or six-hour stretch at night. Now, at four months, they're up every two hours again, and you're bleary-eyed at 3 a.m. searching "4 month old sleep schedule" on your phone, wondering what changed. You're not doing anything wrong. This age comes with a real, well-documented shift in how babies cycle through sleep, one that the American Academy of Sleep Medicine addresses directly in its guidance that infants 4 to 12 months need 12 to 16 hours of sleep across a 24-hour day, naps included (Paruthi et al., 2016). This guide covers what a workable 4 month old sleep schedule actually looks like, why this stretch feels so hard, and what to try tonight.
What a 4 Month Old Sleep Schedule Actually Looks Like
There's no single correct 4 month old sleep schedule, but most babies this age land in a similar shape. Expect 3 to 4 naps during the day, wake windows of about 1.5 to 2.25 hours, and a bedtime somewhere in the early evening, often between 6:30 and 8 p.m. Nighttime sleep tends to run 10 to 12 hours, though it's broken up by one or more feeds for most babies.
Total sleep across the full day, naps plus night, generally falls between 12 and 16 hours (Paruthi et al., 2016). That's a wide range, and where your baby lands in it depends on their own rhythm, not on anything you're doing right or wrong. A baby who sleeps 13 hours a day and one who sleeps 15 can both be perfectly healthy.
What matters more than hitting an exact number is the shape of the day: predictable-ish nap timing, a wind-down before bed, and enough daytime sleep that your baby isn't overtired by evening. Overtiredness, not undertiredness, is usually what turns bedtime into a fight.
Why Sleep Changes So Much Around 4 Months (The "4-Month Sleep Regression")
Parents often describe this stretch as the 4-month sleep regression, and the name fits the experience even if it's not really a step backward. Around this age, a baby's sleep architecture shifts from the simpler newborn pattern into something closer to adult sleep cycles, alternating between lighter and deeper stages roughly every 45 to 60 minutes, with brief wake-ups between cycles (Henderson et al., 2010).
Newborns can often sleep straight through those transitions without stirring. A 4-month-old is more likely to fully wake at the boundary between cycles and need help getting back down, especially if they fell asleep being held, fed, or rocked and wake up somewhere different, like a crib. That mismatch between how they fell asleep and how they wake up is a big part of why night waking spikes right now.
This shift is permanent, not something that passes and reverts. The goal isn't to wait it out, it's to help your baby build the skill of settling back to sleep on their own between cycles, which is exactly what a consistent routine and reasonable wake windows help with over the following weeks.
Sample 4 Month Old Sleep Schedules You Can Try Tonight
Every baby is different, but starting from a real example is easier than building one from scratch. Here are two common patterns.
A 4-nap schedule (common closer to 4 months)
- 7:00 a.m. – Wake for the day
- 8:30 a.m. – Nap 1 (about 45–60 min)
- 10:30 a.m. – Nap 2 (about 45–60 min)
- 12:30 p.m. – Nap 3 (about 45 min)
- 2:30 p.m. – Nap 4, shorter (30–45 min)
- 4:30–5:00 p.m. – Last wake window of the day
- 6:45 p.m. – Bedtime routine starts
- 7:15 p.m. – Asleep for the night, with feeds as needed
A 3-nap schedule (common closer to 5 months)
- 7:00 a.m. – Wake for the day
- 9:00 a.m. – Nap 1 (about 60–90 min)
- 12:00 p.m. – Nap 2 (about 60–90 min)
- 3:00 p.m. – Nap 3, shorter (30–45 min)
- 6:30 p.m. – Bedtime routine starts
- 7:00 p.m. – Asleep for the night, with feeds as needed
Use whichever version matches your baby's current pattern rather than forcing the "correct" one for their exact age. Some four-month-olds are ready to drop to three naps early; others need the fourth nap for another month. If you want to see how this pattern shifts as your baby grows, our baby sleep schedule by age guide walks through the months ahead.
How Many Naps and How Long Should They Last
Most 4-month-olds take 3 to 4 naps, and nap length varies more than parents expect, anywhere from a quick 30-minute catnap to a solid 2-hour stretch. A baby doesn't need every nap to be long to have a good day. What tends to matter more is that at least one or two naps hit a restorative length, generally 45 minutes or longer, since shorter naps often reflect a baby who's only completing one sleep cycle before waking.
If your baby is taking mostly 30-to-40-minute naps and seeming cranky by late afternoon, it's worth trying a slightly shorter wake window before the next nap rather than a longer one. Overtired babies often fight sleep and take worse naps, not better ones, which can feel backward until you've seen it happen.
Signs Your Baby Is Ready for More Structure
Around 4 months, many babies start showing signals that a loose, feed-on-demand rhythm is ready to shift toward something more predictable:
- Naps start clustering around similar times most days, even without much effort from you.
- Your baby fusses or rubs their eyes at a fairly consistent point after waking, giving you an early warning before overtiredness sets in.
- Overnight feeds start spacing out on their own, without you extending them.
- Bedtime around the same time each evening seems to help, rather than your baby fighting an early bedtime.
None of these need to be present all at once, and a baby can be perfectly ready for a schedule with only one or two of these signs showing. If your days still feel chaotic, that's normal too. A consistent bedtime routine built around the same few steps each night, even simple ones like a dim room, a feed, and a short cuddle, tends to bring structure faster than trying to nail exact clock times.
Common Sleep Challenges at This Age
Short naps. A baby who wakes crying after exactly 30–40 minutes is often waking at the boundary between sleep cycles and not yet able to link them together. This tends to improve with practice and isn't a sign of a bigger problem on its own.
More night waking than a month ago. This is the regression itself, a shift in sleep architecture, not a step backward in your baby's development (Henderson et al., 2010). It usually settles over several weeks as your baby gets better at self-soothing between cycles.
Fighting sleep at bedtime. Often this points to a wake window that's run too long. An overtired baby produces more cortisol and adrenaline, which can make falling asleep harder, not easier, even though they clearly need rest.
Needing to be held or fed to sleep every time. This is developmentally normal at 4 months and not something to fix urgently. If it starts feeling unsustainable, a gentler approach to independent settling, introduced gradually, tends to work better than an abrupt change. Our gentle sleep training guide covers methods that don't involve leaving your baby to cry alone, though most specialists suggest waiting until at least 4 to 6 months and checking with your pediatrician first.
See how this schedule shifts month by month. Our baby sleep schedule by age guide maps out nap counts and wake windows from newborn through toddlerhood, so you know roughly what's coming next.
Building a Routine That Actually Sticks
Consistency matters more than precision right now. A predictable sequence before naps and bedtime, even a short one, cues your baby's body that sleep is coming, which tends to shorten the time it takes to settle.
Tonight, try this: pick a simple 3-step wind-down, dim lights, a feed, a few minutes of quiet holding, and use it before every sleep period, not just bedtime. Watch your baby's tired cues rather than the clock alone, and put them down at the first signs of sleepiness instead of waiting for full meltdown. If a nap runs short, don't rush to the next wake window immediately, offer a few minutes of calm before deciding the nap is truly over.
Give any new pattern at least a week before judging whether it's working. Sleep at this age is genuinely inconsistent, some nights and naps will be smooth and others won't, and that unevenness is normal, not a sign your schedule is wrong.
Common Questions from Parents
My 4 month old was sleeping through the night and now isn't. Did I do something wrong?
No. This is almost always the 4-month sleep regression, a real change in how your baby's sleep is structured, not a result of anything you did (Henderson et al., 2010). The waking usually eases over several weeks as your baby gets more practice settling themselves between sleep cycles. Keeping a consistent bedtime routine during this stretch tends to help more than any single fix.
Is it okay if my 4 month old only naps 30 minutes at a time?
Occasional short naps are normal, and some babies genuinely nap in shorter bursts at this age without it causing problems. If most naps are short and your baby seems overtired by late afternoon, a slightly shorter wake window beforehand often helps more than trying to extend the nap itself once it's started.
Should I wake my 4 month old from a nap to keep the schedule on track?
Generally, let a nap run its course unless it's pushing so late that it will crowd out the next wake window entirely. Capping a very long nap, more than 2 to 2.5 hours, can help keep the rest of the day on track, but waking a baby from a normal-length nap usually causes more crankiness than it solves.