Newborns sleep about 16 to 17 hours per day, but rarely more than 1 to 3 hours at a stretch. That round-the-clock pattern of short sleep bursts and frequent waking is completely normal for the first few months of life, even though it can feel relentless for new parents.
Total Sleep in the First Three Months
During the first month, most babies log around 16 hours of sleep in a 24-hour period. Some sleep a bit less, some a bit more. What catches many parents off guard is the distribution: those 16 hours come in fragments spread across day and night, with naps lasting roughly 3 to 4 hours and spaced evenly between feedings. After being awake for just 1 to 2 hours, most newborns need to sleep again.
This fragmented pattern exists because newborns haven’t yet developed an internal clock that distinguishes day from night. That ability, called a circadian rhythm, doesn’t begin to mature until around 8 to 12 weeks of age. Before that point, your baby’s sleep windows are driven almost entirely by hunger and comfort rather than light and darkness.
Why Newborns Wake So Often
Feeding is the main reason newborns can’t sleep in long blocks. A newborn’s stomach is tiny, and it empties quickly. Breastfed babies typically eat 8 to 12 times in 24 hours, which works out to a feeding every 1 to 3 hours in the early weeks. As your baby grows, the intervals stretch. By a few weeks in, most exclusively breastfed babies settle into feeding every 2 to 4 hours, and some begin having one longer sleep stretch of 4 to 5 hours. Formula-fed babies often follow a similar trajectory but may space feedings slightly further apart because formula digests more slowly.
In the earliest days, you may actually need to wake your baby to feed. Pediatricians generally recommend not letting a newborn go longer than a few hours without eating until they’ve regained their birth weight and are gaining steadily. Once your baby is feeding well and growing on track, you can start letting them sleep until they wake on their own for a feeding.
How Newborn Sleep Cycles Differ From Yours
Adult sleep cycles last about 90 minutes and are dominated by deep, non-REM sleep. Newborns are different. Their sleep is split roughly 50/50 between REM (the lighter, dream-associated stage) and non-REM sleep. That high proportion of light sleep means newborns stir, twitch, and wake more easily. You’ll notice fluttering eyelids, small movements, and brief fussing that don’t necessarily mean the baby is fully awake. Giving your baby a moment before picking them up can sometimes allow them to settle back to sleep on their own.
When Babies Start Sleeping Longer Stretches
Most babies don’t sleep through the night, defined as a 6- to 8-hour stretch without waking, until at least 3 months of age or until they weigh 12 to 13 pounds. That said, the range is wide. Some babies reach this milestone earlier, and others don’t consistently sleep through the night until closer to their first birthday. Neither end of that range is a cause for concern on its own.
The shift happens gradually. As your baby’s circadian rhythm matures between 8 and 12 weeks, nighttime sleep stretches tend to lengthen while daytime naps consolidate into more predictable windows. You can help this process along by exposing your baby to natural light during the day, keeping nighttime feedings dim and quiet, and establishing a simple bedtime routine.
Safe Sleep Basics
Because newborns spend so much of their day asleep, how they sleep matters as much as how long. The current guidelines from the CDC are straightforward:
- Always on their back. Place your baby on their back for every sleep, including naps.
- Firm, flat surface. Use a safety-approved crib or bassinet with a firm mattress and a fitted sheet. No inclines, no soft bedding, no pillows, no bumper pads.
- Room-sharing without bed-sharing. Keep the crib or bassinet in your room for at least the first 6 months. Sharing a room (but not a bed) significantly reduces the risk of sleep-related infant death.
Signs a Newborn Is Sleeping Too Much
It sounds counterintuitive, but a newborn can sleep too much if it means they’re not eating enough. A baby who sleeps continuously and shows little interest in feeding may be ill. The key distinction is between a baby who sleeps a lot but wakes easily, feeds well, and is alert during awake periods versus one who is hard to rouse, sluggish even when awake, and unresponsive to sounds or visual stimulation.
Lethargy in a newborn looks different from simple sleepiness. A lethargic baby appears to have little energy, may be difficult to wake for feedings, and doesn’t engage with you even when their eyes are open. If your newborn suddenly starts sleeping significantly more than usual, is hard to wake, or seems uninterested in feeding, that warrants a call to your pediatrician. A change in your baby’s typical pattern is more telling than the total number of hours they sleep.