Most babies need 10 to 12 hours of nighttime sleep by the time they’re 4 to 6 months old, though they won’t necessarily get all of it in one unbroken stretch. Newborns are a different story entirely, sleeping in short bursts around the clock with no real distinction between day and night. The answer shifts significantly depending on your baby’s age, and understanding what’s normal at each stage can save you a lot of unnecessary worry.
Newborns: 0 to 3 Months
Newborns need 14 to 17 hours of total sleep per day, but almost none of it happens in long nighttime blocks. Their sleep is spread across the full 24-hour day in stretches of 2 to 4 hours, broken up by feeding. At this age, a baby’s brain hasn’t yet developed a circadian rhythm, the internal clock that tells us to be awake during the day and asleep at night. That process begins around 8 to 9 weeks, when the hormones that regulate sleep and waking start following a day-night pattern.
During these first months, nighttime sleep might total anywhere from 8 to 10 hours, but it will be interrupted multiple times by hunger. Newborn stomachs are tiny, and both breastfed and bottle-fed babies need frequent feeds to support rapid growth. There is no realistic expectation for a newborn to sleep through the night, and attempting to force longer stretches can interfere with healthy weight gain.
4 to 6 Months: Longer Stretches Begin
Babies aged 4 to 11 months need about 12 to 15 hours of total sleep per day, including naps. Most of that sleep starts consolidating into nighttime hours during this window. By around 3 months, many babies begin sleeping 6 to 8 hours at night without waking, though plenty of healthy babies take longer to reach this milestone.
This is also when early self-soothing abilities emerge. Between 4 and 6 months, babies’ sleep cycles start maturing, and they may begin connecting one cycle to the next on their own, sometimes by sucking their fingers or rubbing a familiar texture. This doesn’t mean every baby will do it. It means the biological groundwork is being laid. A baby who briefly stirs between sleep cycles and drifts back off may appear to be “sleeping through the night” even though they technically woke up.
That distinction matters. Pediatric experts define a good infant sleeper not as a baby who never wakes, but as one who wakes and can get back to sleep independently. Even at 6 months, brief nighttime wakings are completely normal.
6 to 12 Months: What “Through the Night” Actually Means
By 6 months, most babies are capable of sleeping 10 to 12 hours at night, with the remaining daily sleep happening across two or three daytime naps. In clinical terms, “sleeping through the night” for an infant means 6 to 8 consecutive hours, not the 10 or 11 hours an adult might picture. If your 8-month-old sleeps from 7 p.m. to 2 a.m. before waking, that technically counts.
Feeding needs play a role in how long your baby sleeps without interruption. Bottle-fed babies tend to drop night feeds earlier, often around 6 months. Breastfed babies frequently need at least one overnight feed until closer to 12 months. Breast milk digests faster than formula, so breastfed babies genuinely get hungry sooner. This isn’t a sign of a sleep problem.
Sleep Regressions and Setbacks
Even babies who’ve been sleeping well for weeks can suddenly start waking more often. These regressions are predictable and tied to developmental leaps. The most common one hits around 4 months, when a baby’s sleep architecture permanently shifts to more adult-like patterns. Sleep cycles become lighter and more defined, making it easier for babies to wake fully between them.
Another common disruption arrives around 9 months, driven largely by separation anxiety. Babies at this age become acutely aware that you exist even when you’re not visible, and waking in a dark room without you can feel alarming. Physical milestones like rolling over, pulling up to stand, or crawling also cause temporary setbacks. Babies sometimes wake up and want to practice their new skills instead of going back to sleep. These regressions typically last 2 to 4 weeks and resolve on their own.
Nighttime Sleep vs. Nap Balance
Total sleep needs don’t change dramatically between 4 and 12 months, but how that sleep is divided between day and night does. A 4-month-old might take three or four naps totaling 3 to 4 hours and sleep 10 to 11 hours at night. By 9 to 12 months, most babies have dropped to two naps totaling 2 to 3 hours, with nighttime sleep stretching to 11 or 12 hours.
If your baby is napping excessively during the day and resisting bedtime or waking frequently at night, the balance may need adjusting. Conversely, a baby who skips naps often becomes overtired, which paradoxically makes nighttime sleep worse. Overtired babies produce more stress hormones, making it harder for them to fall asleep and stay asleep.
Setting Up Safe Sleep
However long your baby sleeps, the environment matters. The CDC recommends keeping your baby’s crib or bassinet in your room for at least the first 6 months. The sleep surface should be firm and flat, with nothing else in it: no blankets, pillows, bumper pads, or stuffed animals. Babies should always be placed on their backs.
These guidelines apply to every sleep period, including naps. A baby who falls asleep in a swing, car seat, or on a couch and is left there faces a higher risk of suffocation. If your baby falls asleep somewhere other than their crib, moving them to a safe sleep surface is always the right call, even if it means briefly waking them.
Quick Reference by Age
- 0 to 3 months: 14 to 17 hours total. Nighttime sleep comes in 2- to 4-hour stretches. Multiple night feeds are expected.
- 4 to 6 months: 12 to 15 hours total. Many babies begin sleeping 6 to 8 hours at night. Self-soothing skills start developing.
- 6 to 9 months: 12 to 15 hours total. Nighttime stretches of 10 to 11 hours become possible. Breastfed babies may still need one overnight feed.
- 9 to 12 months: 12 to 15 hours total. Most babies sleep 11 to 12 hours at night with two daytime naps. Separation anxiety may cause temporary regressions.
Every baby is different, and the ranges above are exactly that: ranges. A baby who consistently sleeps a bit less or a bit more than these numbers but is gaining weight well, alert during wake times, and meeting developmental milestones is likely getting exactly the sleep they need.