For the first one to two weeks, you should wake your newborn to feed at least every two to four hours, even if they seem perfectly happy sleeping. Once your baby has regained their birth weight, which typically happens within one to two weeks, you can generally let them sleep until they wake up on their own. That birth weight milestone is the key turning point most pediatricians use to give the green light for longer stretches.
Why the First Two Weeks Matter Most
Most newborns lose weight in the first few days after birth. During this window, frequent feedings are essential to reverse that loss and establish a healthy growth trajectory. The CDC recommends breastfed newborns eat 8 to 12 times in a 24-hour period, which works out to roughly every two to three hours. Formula-fed babies follow a similar schedule in those early days.
Newborns have tiny stomachs and burn through calories quickly. Going too long without eating can cause their blood sugar to drop, a condition called hypoglycemia. Babies at higher risk for low blood sugar, including those born premature or small for their gestational age, should be fed at least every three hours. For a healthy, full-term baby, the general rule during those first two weeks is: don’t let more than four hours pass without a feeding, day or night.
The Birth Weight Milestone
The moment most parents are waiting for is when their pediatrician says they can stop setting alarms for nighttime feeds. That usually happens once the baby has regained their birth weight, which takes one to two weeks for most newborns. At that point, your baby has proven they’re eating enough to grow, and their body is better equipped to handle a longer gap between meals.
After hitting this milestone, you can let your baby sleep as long as they want at night. Some babies will still wake every two to three hours out of hunger. Others might surprise you with a four- or five-hour stretch. Both are normal. The important thing is that your baby continues to gain weight steadily at subsequent checkups. If weight gain stalls or your baby seems unusually sleepy during the day, it’s worth revisiting the feeding schedule with your pediatrician.
How Much Newborns Actually Sleep
Newborns sleep a lot. About 16 hours a day on average, split roughly in half between daytime and nighttime. But those hours come in short bursts rather than long blocks. A single sleep stretch might last anywhere from 45 minutes to three or four hours, because newborns cycle through sleep stages quickly and wake easily.
About half of a newborn’s sleep is spent in a lighter, dream-like stage, which is one reason they startle awake so often. This pattern is actually protective in the early weeks. It keeps babies from sleeping so deeply that they miss hunger cues. As your baby matures, sleep gradually consolidates into longer nighttime stretches, but don’t expect anything resembling a predictable schedule for at least the first couple of months.
Jaundice and Other Reasons to Wake More Often
Some newborns need to be woken for feedings more frequently, even after they’ve regained birth weight. Jaundice, the yellowish tint in a baby’s skin and eyes caused by elevated bilirubin, is one of the most common reasons. Jaundice is especially common in preterm babies and during the first couple of weeks. More frequent feedings help the body process and clear bilirubin faster, so your pediatrician may ask you to feed every two to three hours around the clock until levels come down.
Babies born even a few weeks early (sometimes called “late preterm”) also tend to be sleepier and less effective feeders. They may not wake reliably when hungry, which means you’ll need to stay on a stricter schedule longer. If your baby falls into any of these categories, your pediatrician will give you specific guidance on when it’s safe to relax the schedule.
Normal Sleepiness vs. Something Wrong
New parents often wonder whether their baby is sleeping a normal amount or something is off. The distinction comes down to what happens when your baby is awake. A healthy newborn who sleeps a lot will still be alert and active during wake periods, feed well, and respond to your voice and touch. They can be comforted when upset and show clear hunger cues when it’s time to eat.
A lethargic baby looks different. They appear drowsy or sluggish even when “awake,” show little interest in feeding, and are hard to rouse. They may not respond to sounds or visual stimulation. Lethargy can be a sign of infection, low blood sugar, or other conditions that need prompt attention. If your newborn is consistently difficult to wake for feedings, or seems limp and unresponsive when you do wake them, that warrants a call to your pediatrician right away.
Helping Your Baby Sleep Longer at Night
Newborns don’t know the difference between day and night. Their internal clock takes weeks to develop, which is why many babies have their longest alert stretches at 2 a.m. You can nudge this process along with simple environmental cues. During the day, expose your baby to natural light when they’re awake. Open the blinds, sit near a window, or take a brief walk outside if the weather allows. This helps build the association between light and wakefulness.
At night, keep things dark and boring. Use dim lighting for feedings and diaper changes, keep your voice low, and avoid stimulating play. Make the nursery as dark as possible for sleep, including naps. These consistent signals won’t produce overnight results, but over the course of several weeks, they help your baby’s brain start distinguishing day from night, which naturally leads to longer nighttime sleep stretches.