A 4-month-old typically sleeps 10 to 12 hours at night, though not all of that is continuous. Most babies this age wake once or twice for a feeding before falling back asleep. Total sleep across a full day, including naps, falls between 12 and 16 hours.
Four months is a turning point for infant sleep. Your baby’s sleep patterns are shifting in ways that can feel confusing, but understanding what’s normal at this age makes it much easier to set realistic expectations.
What Nighttime Sleep Looks Like at 4 Months
Most 4-month-olds get their longest unbroken stretch of sleep at night, typically 5 or more hours before waking for a feeding. Some babies stretch this to 6 or 8 hours, while others still wake more frequently. By 6 months, most babies sleep 9 hours or longer at night with only brief awakenings, so your baby is on the path toward that milestone but likely isn’t there yet.
During the day, naps add another 3 to 4 hours of sleep spread across at least two nap sessions. So if your baby sleeps about 11 hours at night (with wake-ups to feed) and naps for 3 to 4 hours, they’re right in the recommended 12-to-16-hour range.
Why Sleep Gets Harder at 4 Months
If your baby was sleeping well as a newborn and suddenly isn’t, you’re not imagining it. Around 4 months, babies develop more mature sleep cycles. Newborns spend most of their sleep time in deeper stages, but at 4 months, your baby starts cycling through lighter stages of sleep, similar to adults. That means they’re more easily woken up and may stir between sleep cycles in a way they didn’t before.
This shift is commonly called the 4-month sleep regression, though it’s really a permanent change in how your baby sleeps rather than a temporary setback. The good news is that babies adapt. The rough patch, where night wakings spike and naps get shorter, usually lasts two to six weeks before settling into a more predictable rhythm.
Night Feedings at This Age
At 4 months, one or two night feedings is normal. If your baby is waking to eat more than twice a night, that pattern may be worth adjusting, since most babies at this age can go 5 or more hours between feedings overnight. Breastfed babies tend to wake slightly more often than formula-fed babies because breast milk digests faster, but the general guideline holds for both.
A feeding that happens around 5 or 6 hours after bedtime is likely hunger. A waking that happens 45 minutes after falling asleep is more likely a sleep-cycle transition, and your baby may resettle on their own if given a minute or two.
Wake Windows and Bedtime Timing
How well your baby sleeps at night depends partly on how their daytime is structured. At 4 months, most babies can handle 1.5 to 2.5 hours of awake time between sleep periods. Shorter wake windows work better in the morning, while the longest stretch of wakefulness usually falls right before bedtime.
If your baby stays awake too long between naps, they become overtired, which paradoxically makes it harder to fall asleep. When babies get overtired, their bodies release stress hormones like cortisol and adrenaline that amp them up instead of calming them down. The result is a wired, fussy baby who fights sleep and then sleeps poorly once they finally drift off.
Most families find that a bedtime somewhere between 7:00 and 8:00 PM works well at this age, since it aligns with natural circadian rhythms and allows for a long overnight stretch. If your baby’s last nap ends around 4:30 or 5:00 PM, a bedtime about 2 to 2.5 hours later hits the sweet spot.
How to Spot Sleepiness Before It’s Too Late
Catching your baby’s early tired cues makes bedtime and naptime significantly smoother. The first signs are subtle: yawning, droopy eyelids, staring into the distance, or furrowed brows. Your baby may rub their eyes, pull on their ears, or start sucking their fingers.
If you miss those signals, the next wave is harder to work with. A baby who has tipped into overtiredness often becomes clingy, turns away from the bottle or breast, and starts a low, prolonged whine (sometimes called “grizzling”) that can escalate into frantic crying. Some overtired babies even sweat more than usual, because the same stress hormones that make them wired also raise body temperature. Once you see these signs, getting your baby to sleep takes more effort, so aim to start your wind-down routine at the first yawn or eye rub.
Safe Sleep Setup
At 4 months, your baby should still sleep on their back, on a firm and flat mattress, in their own sleep space like a crib, bassinet, or portable play yard. Keep the sleep area free of loose blankets, pillows, stuffed animals, and bumper pads. Avoid letting your baby sleep on a couch, armchair, or in a car seat or swing outside of travel. These guidelines from the American Academy of Pediatrics apply until your baby’s first birthday.
What “Sleeping Through the Night” Actually Means
In sleep research, “sleeping through the night” is defined as 6 to 8 consecutive hours, not the 10 or 11 hours that adults picture. Many 4-month-olds can do a 6-hour stretch, and some do more. But plenty of healthy, normal babies still wake once or twice, eat quickly, and go right back to sleep. That counts as good sleep for this age.
If your baby sleeps from 7:30 PM to 1:00 AM, feeds, then sleeps again until 5:30 or 6:00 AM, that’s a solid night. You’re getting roughly 10 to 11 hours of nighttime sleep with one wake-up, which is right where a 4-month-old should be. The stretches will gradually lengthen over the next couple of months as your baby’s stomach grows and their sleep cycles mature.