Newborns don’t sleep in one long stretch at night. They typically sleep 16 to 17 hours total per day, but only 1 to 2 hours at a time, waking frequently to eat. In the first weeks of life, a newborn shouldn’t go more than about four hours without a feeding, so true “sleeping through the night” isn’t realistic or safe until later.
Why Newborns Wake So Often
A newborn’s brain hasn’t yet developed the internal clock that tells adults when it’s night and when it’s day. Circadian rhythms don’t begin forming until around two to four months of age, and they aren’t fully established until at least twelve months, often later. So for your newborn, 3 a.m. and 3 p.m. feel exactly the same.
Sleep cycles also play a role. Newborns spend roughly half their sleep time in REM (active, lighter sleep), which means they surface to partial wakefulness more often than older babies or adults. Combine that with a tiny stomach that empties quickly, and you get a baby who genuinely needs to wake every couple of hours.
Night Feedings in the First Weeks
In the early weeks, babies need to eat every 2 to 4 hours around the clock. That adds up to about 8 to 12 feedings in a 24-hour period. You may actually need to wake your baby to feed, especially if they’re sleeping past that four-hour mark. Stroking, undressing, or changing the diaper can help rouse a sleepy newborn enough to latch or take a bottle.
Some babies cluster feed, eating as often as every hour during certain stretches (often in the evening), then sleeping a slightly longer block of 4 to 5 hours afterward. This is normal and doesn’t mean your milk supply is low or that something is wrong. It’s your baby front-loading calories so they can manage a longer rest.
When Longer Stretches Begin
Most babies start consolidating their nighttime sleep as their circadian rhythm kicks in around two to four months. By about four months, many babies can manage a stretch of six or seven hours at night. That’s actually what pediatricians mean by “sleeping through the night.” It doesn’t mean 8 p.m. to 7 a.m. It means one unbroken block that lets you get a meaningful chunk of rest.
Whether your baby hits this milestone on the earlier or later side depends on several factors: how they’re fed (formula is digested more slowly than breast milk, so formula-fed babies sometimes stretch sooner), their weight gain trajectory, and their individual temperament. Formula-fed babies over six months who still wake at night are unlikely to be waking from hunger. For breastfed babies, night feeds may remain nutritionally important longer, and night weaning is generally considered an option from around twelve months.
What a Typical Night Looks Like by Age
- 0 to 6 weeks: Sleep comes in 1- to 2-hour bursts with feedings in between. There’s no real difference between day and night for the baby.
- 6 weeks to 3 months: Some babies begin offering one longer stretch of 3 to 4 hours, usually in the first half of the night. Feedings are still frequent.
- 3 to 4 months: The circadian rhythm starts to emerge. A stretch of 4 to 5 hours becomes more common, and some babies reach 6 hours.
- 4 to 6 months: Six- to seven-hour stretches become more realistic for many babies, though plenty still wake once or twice.
These are ranges, not deadlines. A baby who doesn’t hit six hours by four months isn’t behind. Sleep development is as variable as any other milestone.
Helping Your Newborn Sleep Safely
Since your baby will be sleeping in short bursts throughout the night, the sleep environment matters every single time you put them down. Place your baby on their back, in their own sleep space, with no other people. Use a crib, bassinet, or portable play yard with a firm, flat mattress and a fitted sheet. Keep loose blankets, pillows, stuffed toys, and bumpers out of the sleep space entirely.
Avoid letting your baby sleep on a couch, armchair, or in a car seat or swing (unless they’re actually riding in the car). Keep the room between 68 and 78°F, and consider a fan on low to keep air circulating. Breastfeeding, when possible, is also associated with lower sleep-related risks.
Building Better Nighttime Habits Early
You can’t sleep train a newborn, but you can start laying groundwork. During daytime feedings, keep lights on and interact normally. For nighttime feedings, keep the room dim, your voice quiet, and the interaction minimal. This contrast helps your baby’s developing brain start associating darkness and calm with sleep, even before their circadian rhythm fully matures.
Swaddling (with arms positioned safely and hips loose) can reduce the startle reflex that jolts newborns awake during lighter sleep phases. Once your baby shows signs of rolling, swaddling should stop. A consistent short routine before the longest sleep stretch, even something as simple as a diaper change, a feeding, and being placed in the bassinet, gives your baby repeated cues that this particular stretch is meant to be a longer one.