Newborns sleep about 16 to 17 hours per day, but rarely more than 1 to 2 hours at a stretch. That round-the-clock pattern of sleeping, waking, feeding, and sleeping again can feel relentless for new parents, but it’s exactly what a healthy newborn’s body is designed to do.
How Much Sleep Newborns Actually Get
Those 16 to 17 hours aren’t organized into anything resembling an adult sleep schedule. A newborn’s sleep is scattered across the entire 24-hour day in short bursts, with no real difference between daytime and nighttime. Between 1 and 3 months of age, babies typically sleep for 3 to 5 hours at a time overnight before waking to feed.
Between sleep stretches, newborns are awake for surprisingly brief windows. In the first month, a baby can only handle about 30 minutes to 1 hour of wakefulness before needing to sleep again. By 1 to 3 months, that wake window extends to roughly 1 to 2 hours. Trying to keep a newborn awake longer than these windows usually backfires, leading to an overtired, fussy baby who has a harder time falling asleep.
Why Newborns Don’t Sleep in Long Stretches
Two things drive the short sleep cycles. First, newborns are born without a functioning circadian rhythm. Adults produce melatonin at night and cortisol in the morning, which locks sleep to a predictable schedule. Babies don’t start releasing these hormones in a rhythmic pattern until around 8 to 9 weeks old. Before that point, their bodies simply can’t distinguish day from night.
Second, newborn stomachs are tiny. They need to eat frequently, and that biological need overrides sleep. Babies younger than 4 weeks old should not go longer than 4 to 5 hours without food, even if they seem content to keep sleeping. Breastfed babies tend to wake more often than formula-fed babies because breast milk digests faster. A 3-month-old on formula may eat every 3 to 4 hours, while a breastfed baby of the same age often eats every 2 to 3 hours. Those more frequent wakings among breastfed infants are actually associated with a lower risk of sudden infant death syndrome.
What Newborn Sleep Looks Like
Newborn sleep is roughly split 50/50 between active sleep (the equivalent of REM sleep in adults) and quiet sleep. During active sleep, you’ll notice your baby’s eyes moving beneath their eyelids, twitching, making small sounds, or even briefly smiling. Their breathing may be irregular. This is normal and not a sign of discomfort. During quiet sleep, breathing becomes more rhythmic and movements settle down. Both phases are essential for brain development.
Because newborns spend so much time in active sleep, they’re easy to wake. A door closing, a dog barking, or being set down in a crib can pull them out of a sleep cycle. This improves naturally as the ratio shifts toward more quiet sleep over the first few months.
When Longer Sleep Stretches Begin
Most babies don’t sleep for a 6 to 8 hour stretch without waking until at least 3 months of age, or until they weigh 12 to 13 pounds. That’s what pediatricians typically mean by “sleeping through the night,” and even that milestone varies widely from baby to baby. Some infants reach it at 3 months, others not until 6 months or later.
Around 8 to 9 weeks, you may notice the earliest signs of a more predictable pattern as your baby’s internal clock starts to develop. Sleep may begin consolidating into longer nighttime blocks with more wakefulness during the day. This is a gradual shift, not a switch that flips overnight. Exposing your baby to natural light during the day and keeping nighttime feedings dim and quiet can help reinforce the emerging rhythm.
Safe Sleep Basics
The AAP’s 2022 recommendations, supported by the CDC, are straightforward:
- Always on their back. Every sleep, every nap, every time.
- Firm, flat surface. A safety-approved crib or bassinet with a fitted sheet. No inclined sleepers, no car seats used as regular sleep spots.
- Nothing else in the crib. No blankets, pillows, bumper pads, or stuffed animals.
- Room-sharing without bed-sharing. Keep the crib or bassinet in your room for at least the first 6 months.
- Comfortable temperature. Keep the room between 68 and 78°F. If your baby is sweating or their chest feels hot, they’re overdressed.
A pacifier at nap time and bedtime is also recommended. If you’re breastfeeding, waiting until nursing is well established before introducing one is reasonable.
Signs a Baby Is Sleeping Too Much
It sounds counterintuitive, but a newborn can sleep too much if it means they’re not eating enough. This is particularly common in the first two weeks of life and in babies with jaundice, which causes sleepiness. Watch for these warning signs:
- The baby seems very lethargic and is difficult to rouse for feedings
- The baby is 2 weeks old and hasn’t regained their birth weight
- Fewer than four very wet diapers per day
- The baby doesn’t seem calmer or satisfied after eating
In the early weeks, you may need to wake your baby to feed if they sleep past that 4 to 5 hour mark. Once your pediatrician confirms steady weight gain, you can generally let your baby sleep as long as they want between feedings. Seek immediate care if a baby is gasping, wheezing, has flaring nostrils while breathing, has a fever, or if the skin around their ribs visibly pulls inward with each breath.