Yes, it is normal for a newborn to sleep most of the day. Newborns average about 16 hours of sleep in a 24-hour period, spread across many short stretches rather than one long block. What matters most is not how much your baby sleeps, but whether they wake enough to feed, produce enough wet diapers, and respond to you when they are awake.
How Much Newborns Typically Sleep
Sixteen hours a day is the average, but some healthy newborns sleep closer to 18 or 19 hours. That can feel alarming when you expected more awake time, but newborns simply don’t have long alert windows yet. Their sleep cycles are short, roughly 45 to 60 minutes each, and about half of every cycle is spent in light, active (REM) sleep. Because they’re naturally lighter sleepers, they tend to stir, grunt, or briefly open their eyes between cycles before drifting off again. This can make it look like your baby never fully wakes up.
Unlike adults, newborns don’t distinguish between day and night. Their sleep is scattered in roughly equal chunks around the clock, which is why it can seem like they’re “sleeping all day” even though they’re also sleeping all night. A more organized pattern with longer nighttime stretches usually doesn’t develop until around 3 to 4 months.
Growth Spurts Can Add Hours of Sleep
If your newborn suddenly seems even sleepier than usual, a growth spurt may be the reason. A study published through the American Academy of Sleep Medicine tracked infants starting at a median age of 12 days and found that during growth spurts, babies slept an average of 4.5 extra hours per day for about two days. They also took roughly three additional naps per day during those bursts. Measurable increases in body length tended to follow within 48 hours.
These sleep surges are irregular and unpredictable, so they can catch you off guard. One day your baby seems to have a normal pattern, and the next they barely open their eyes. As long as your baby is still feeding and producing wet diapers, a temporary jump in sleep is a sign of healthy development, not a problem.
When to Wake a Sleeping Baby to Feed
Newborns need 8 to 12 feedings per day, which works out to roughly every 2 to 3 hours. In the first couple of weeks, most babies lose some weight after birth and need to regain it, so feeding frequently is critical. If your baby has been asleep for more than four hours, wake them to eat.
Once your baby has regained their birth weight (typically within one to two weeks), you generally don’t need to set an alarm. At that point, it’s fine to let your baby sleep until they wake on their own, as long as they’re gaining weight steadily and meeting diaper targets. Your pediatrician will confirm at early checkups whether your baby has hit that milestone.
Diaper Output as a Quick Health Check
The easiest way to confirm that a sleepy newborn is getting enough milk is to count diapers. After the first five days of life, a breastfed baby should produce at least six wet diapers per day. Fewer than that can signal dehydration, especially in a baby who is sleeping through feedings. If you’re consistently falling short of six wet diapers, your baby likely needs to eat more often, even if that means waking them.
Sleepy vs. Lethargic: How to Tell the Difference
There is an important distinction between a baby who sleeps a lot and a baby who is lethargic. A healthy sleepy newborn will wake for feedings (even if you have to nudge them), latch and suck with some energy, and show alert or responsive behavior during at least some awake periods. They react to sounds, make eye contact, and can be comforted when they cry.
A lethargic baby looks different. They appear to have little energy even when awake, are hard to rouse for feedings, and don’t respond normally to sounds or visual cues. They may feel floppy or limp when you pick them up. If your baby is difficult to wake, feeds poorly even after being woken, or seems unusually unresponsive, that warrants prompt medical attention.
Jaundice and Excessive Sleepiness
One common medical cause of unusual sleepiness in newborns is jaundice, a buildup of a waste product called bilirubin that turns the skin and eyes yellowish. Mild jaundice is extremely common and usually harmless, but when bilirubin levels climb too high, it can make a baby increasingly drowsy and hard to wake. This creates a cycle: the baby sleeps too much, misses feedings, and the reduced intake makes jaundice worse.
If your baby’s skin or the whites of their eyes look yellow, and they seem unusually difficult to rouse or uninterested in feeding, contact your pediatrician. Jaundice is easily treated when caught early, typically with light therapy that breaks down the excess bilirubin through the skin.
Safe Sleep While They Rest
Since your newborn will be spending the majority of the day asleep, the sleep environment matters. Place your baby on their back for every sleep, including naps. Use a firm, flat mattress in a safety-approved crib or bassinet with only a fitted sheet. Keep blankets, pillows, stuffed animals, and bumper pads out of the sleep area. The crib or bassinet should be in your room for at least the first six months. Watch for overheating: if your baby is sweating or their chest feels hot to the touch, remove a layer.
Offering a pacifier at nap time and bedtime can also reduce risk. If you’re breastfeeding, you may want to wait until nursing is well established before introducing one.