Newborns sleep a lot, and in most cases, that’s completely normal. A typical newborn sleeps about 16 hours out of every 24, split roughly between 8 to 9 hours during the day and 8 hours at night. That sleep comes in short bursts, with most babies waking every 2 to 3 hours to feed. If your baby is sleeping within that range and waking regularly to eat, there’s very little to worry about.
That said, there’s a real difference between a healthy newborn who sleeps a lot and one who is unusually difficult to wake. Knowing what to look for can help you tell the two apart.
What Normal Newborn Sleep Looks Like
Newborn sleep doesn’t look like adult sleep. About half of a newborn’s 16 hours of daily sleep is spent in active (REM) sleep, which means you’ll notice twitching, fluttering eyelids, irregular breathing, and small movements even while your baby is asleep. This is normal brain development at work, not a sign of restless or poor-quality sleep.
Because their stomachs are tiny and breast milk or formula digests quickly, newborns rarely sleep longer than 3 to 4 hours at a stretch before hunger wakes them. This frequent waking is actually a good sign. It means your baby’s internal cues are functioning the way they should. Most newborns need 8 to 12 feedings per day, or roughly one feeding every 2 to 3 hours.
Why Your Newborn Might Be Sleeping More Than Usual
Some stretches of extra sleep are expected, especially during growth spurts. Growth spurts can temporarily increase how much your baby sleeps and how often they want to eat. These periods are short-lived and typically resolve within a few days. Overstimulation from a busy day, visitors, or a change in environment can also cause a newborn to crash into a longer-than-usual sleep stretch as their developing nervous system recovers.
The first few days after birth are another common time for extra sleepiness. The labor and delivery process is exhausting for babies too, and some simply need more recovery time. Babies born slightly early (even at 37 or 38 weeks) also tend to be sleepier than full-term infants.
Sleepy vs. Lethargic: How to Tell the Difference
This is the distinction that matters most. A sleepy baby wakes up when it’s time to eat, latches or takes a bottle with energy, and has periods of alertness between naps, even if those alert windows are short. A lethargic baby is different. Lethargic or listless babies appear to have little or no energy, are drowsy or sluggish, and may sleep longer than usual. They can be hard to wake for feedings, and even when awake, they don’t seem alert or attentive to sounds or visual cues.
Watch your baby’s feeding behavior closely. A newborn who starts out with a strong, vigorous suck and gradually becomes less effective over time, or one who has a weak suck and doesn’t latch well, may not be getting enough nutrition. A baby who sleeps continuously and shows little interest in feeding may be ill.
Jaundice and Sleepiness
One of the most common medical reasons a newborn sleeps excessively is jaundice. Jaundice causes a buildup of a waste product in the blood that the baby’s immature liver can’t yet process efficiently. The hallmark sign is yellowing of the skin and the whites of the eyes, usually appearing within the first few days after birth.
Mild jaundice is extremely common and often resolves on its own. But when levels get too high, it can make a baby unusually sleepy and hard to rouse. Contact your baby’s pediatrician if the yellowing spreads to the belly, arms, or legs, if the whites of the eyes look yellow, or if your baby seems listless, sick, or difficult to wake up. These can be signs that jaundice needs treatment.
When to Wake Your Baby for Feedings
Even if your baby seems content to keep sleeping, you should wake them to eat if it’s been more than 4 hours since the last feeding. This is especially important in the first few weeks, before your baby has regained their birth weight. Skipping feedings can lead to dehydration, low blood sugar, and further sleepiness, creating a cycle where a hungry baby becomes too tired to eat.
If your baby is difficult to wake, try undressing them down to a diaper, changing their diaper, placing a cool (not cold) washcloth on their forehead, or gently rubbing their feet. Skin-to-skin contact can also help rouse a drowsy baby and encourage feeding.
Tracking Diapers as a Health Check
Wet and dirty diapers are one of the most reliable ways to confirm your newborn is eating enough, even if they seem sleepier than expected. After day 5 of life, your newborn should have at least 6 wet diapers per day. The number of dirty diapers varies, but you should see them regularly in the first month.
If your baby is sleeping a lot but still producing plenty of wet diapers and gaining weight at their checkups, that’s strong evidence they’re getting the nutrition they need. A drop in wet diapers, on the other hand, is a concrete signal to call your pediatrician.
Signs That Need Immediate Attention
Most of the time, a sleepy newborn is just a normal newborn. But certain signs alongside excessive sleepiness warrant a call to your pediatrician or a trip to the emergency room:
- Fever: A rectal temperature of 100.4°F (38°C) or higher in a baby under 3 months is always an emergency.
- Inability to wake: If your baby doesn’t rouse at all for feedings, or wakes but immediately falls back asleep without eating.
- Weak or absent cry: A baby whose cry sounds noticeably weaker or higher-pitched than usual.
- Poor muscle tone: A baby who feels floppy or limp when you pick them up.
- Fewer than 6 wet diapers per day after the first 5 days of life.
- Worsening jaundice: Yellow skin spreading beyond the face, or yellowing of the eyes.
Safe Sleep While They Sleep
Since your newborn is spending so many hours asleep, their sleep environment matters. The American Academy of Pediatrics recommends placing infants on their backs for every sleep, 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. Avoid letting your baby sleep on a couch, armchair, or in a swing or car seat (except while riding in the car).
These guidelines apply to every nap and every nighttime stretch, not just formal “bedtime.” Given how much of their day newborns spend asleep, consistency with safe sleep positioning is one of the most protective things you can do.