A one-week-old baby sleeps roughly 16 to 17 hours in a 24-hour period, though some newborns log as many as 18 or 19 hours. That sleep doesn’t come in long stretches. Instead, it arrives in short bursts of two to four hours, scattered evenly across day and night with no real pattern yet.
If that schedule feels chaotic, it’s because a one-week-old hasn’t developed the internal clock that tells the rest of us when it’s daytime and when it’s night. Understanding what’s going on biologically, and what “normal” actually looks like at this age, can take some of the anxiety out of those first exhausting days.
Why the Sleep Comes in Short Bursts
Adults run on a circadian rhythm, a roughly 24-hour internal clock driven by light exposure. Newborns don’t have one yet. Their brain’s central clock only begins forming after birth, when they first experience cycles of light and dark, and it won’t fully mature until they’re one to two years old. In the meantime, a one-week-old operates on what sleep researchers call an ultradian rhythm: a repeating cycle of sleep and wakefulness that runs about three to four hours long.
That’s why your baby sleeps and wakes around the clock with no preference for nighttime. It takes several weeks after birth for circadian rhythms and sleep-wake patterns to start aligning. Until then, the schedule is dictated almost entirely by hunger and comfort.
What Newborn Sleep Actually Looks Like
About half of a newborn’s sleep time is spent in active sleep, the infant equivalent of REM sleep. During active sleep you’ll notice twitching, fluttering eyelids, irregular breathing, and small movements. This can look like the baby is about to wake up, but it’s a normal and important phase. The other half is quiet sleep, when breathing is more regular and the baby lies still.
A single sleep cycle at this age is much shorter than an adult’s. Babies transition between active and quiet sleep rapidly, which is one reason they seem to stir so often. Brief waking between cycles is completely normal. Some babies settle themselves back to sleep; others need a feeding or soothing to drift off again.
Sleep and Physical Growth
There’s a direct biological link between sleep and your baby’s growth. A study tracking infant development found that each additional hour of daily sleep increased the odds of a measurable growth spurt by about 20 percent. Each additional nap raised those odds by roughly 43 percent. Weight gain and body composition changes were also tied to sleep, but only during periods when the baby was actively growing in length. In other words, sleep isn’t just rest for a newborn. It’s when a significant portion of physical growth happens.
Feeding and Sleep in the First Week
At one week old, your baby’s stomach is tiny, and breast milk or formula digests quickly. Most newborns need to eat every two to three hours, which naturally breaks up their sleep. Some especially sleepy newborns may not wake on their own to feed often enough in the first week or two. If your baby hasn’t regained their birth weight yet, you may need to wake them for feedings rather than letting them sleep through a cycle.
Once feeding is well established and weight gain is on track, most babies will settle into a rhythm of waking when they’re hungry. Until then, keeping feedings frequent supports both nutrition and the energy your baby needs for the rapid development happening in those early days.
Signs Your Baby Is Ready for Sleep
A one-week-old can’t tell you they’re tired, but their body gives clear signals. Early sleepiness cues include yawning, droopy eyelids, staring into the distance, and turning away from stimulation like sounds, lights, or feeding. You might also notice clenched fists, furrowed brows, or ear-pulling.
If those early cues get missed, the baby can tip into overtiredness. At that point, the stress hormones cortisol and adrenaline surge, which paradoxically amps the baby up instead of calming them down. An overtired newborn often cries louder and more frantically than usual, and settling them becomes much harder. Catching those quieter early signs and putting your baby down to sleep promptly makes the whole process smoother.
Creating a Safe Sleep Environment
Because newborns spend so many hours asleep, the safety of their sleep space matters enormously. The American Academy of Pediatrics recommends placing your baby on their back for every single sleep, whether it’s a nap or nighttime. Side sleeping is not considered safe.
The sleep surface should be firm, flat, and designed for infants, like a crib mattress that fits tightly in a safety-approved crib. Nothing else belongs in the sleep space: no pillows, blankets, stuffed animals, bumper pads, or mattress toppers. Weighted blankets and weighted swaddles are also specifically advised against. A fitted sheet over the mattress is all you need.
Room-sharing (not bed-sharing) is recommended for at least the first six months. Keep the baby’s crib or bassinet close to your bed but on a separate surface. For temperature, aim for 68 to 72 degrees Fahrenheit (20 to 22 degrees Celsius) in the room, and dress your baby in no more than one layer beyond what you’d wear comfortably. Skip indoor hats after the first few hours of life, since overheating and head covering both increase risk.
When Sleepiness Is a Concern
Most parents worry at some point that their newborn is sleeping “too much.” Given that 16 to 19 hours a day is normal, what matters more than total hours is whether your baby wakes to feed, has periods of alertness, and is producing enough wet and dirty diapers. A baby who is difficult to rouse, skips feedings repeatedly, or seems limp and unresponsive when awake is showing signs of lethargy, which is different from healthy deep sleep.
Healthy newborns move and twitch during active sleep, respond to being picked up even if they don’t fully wake, and show some alertness during feedings. If your baby feels unusually difficult to wake or seems less responsive than usual, that warrants prompt attention from your pediatrician.