Newborns need 14 to 17 hours of sleep in a 24-hour period, and infants aged 4 to 11 months need 12 to 15 hours. Those totals include both nighttime sleep and naps. But the way that sleep is distributed across the day changes dramatically during the first year, and understanding the pattern matters just as much as hitting the right number.
Sleep Totals by Age
From birth through 3 months, most babies sleep 14 to 17 hours a day. Some especially sleepy newborns log as much as 20 hours. That sleep comes in short bursts of 2 to 4 hours, scattered around the clock with no real preference for day or night.
Between 4 and 11 months, total sleep drops slightly to 12 to 15 hours. By this point, more of that sleep consolidates into nighttime stretches, with the remainder split across two or three daytime naps. By 12 months, most babies are down to two naps a day and sleeping their longest stretch at night.
Why Newborns Sleep in Short Bursts
Newborns don’t have a functioning internal clock yet. The circadian system, which tells the body when it’s day and when it’s night, matures gradually between 1 and 3 months of age. Before that kicks in, babies cycle between sleep and wakefulness without regard for sunlight or darkness. This is why the first few months feel so chaotic for parents.
Newborn sleep also looks different from adult sleep on a biological level. About half of a newborn’s sleep time is spent in REM sleep, the lighter, dream-associated stage. Adults spend only about 20 to 25 percent of their sleep in REM. All that REM sleep is thought to support the rapid brain development happening in the first months of life, but it also means newborns wake more easily and more often.
Wake Windows: How Long Between Naps
The time your baby can comfortably stay awake between sleep periods, sometimes called a wake window, is just as important as total sleep. Keeping a baby up too long makes them overtired, which paradoxically makes it harder, not easier, for them to fall asleep. Here’s what to expect at each stage:
- Birth to 1 month: 30 minutes to 1 hour
- 1 to 3 months: 1 to 2 hours
- 3 to 4 months: 1.25 to 2.5 hours
- 5 to 7 months: 2 to 4 hours
- 7 to 10 months: 2.5 to 4.5 hours
- 10 to 12 months: 3 to 6 hours
These ranges are wide because every baby is different. The lower end of each range often applies to the first nap of the day, when sleep pressure builds quickly, while the longer stretches usually work better later in the afternoon.
Signs Your Baby Is Ready for Sleep
Watching the clock helps, but watching your baby is more reliable. Newborns show distinct physical cues when they’re getting tired: yawning, pulling at their ears, closing their fists, and fluttering their eyelids or staring into space. You might also notice jerky arm and leg movements, arching backward, or a furrowed brow that looks almost worried.
Older babies and toddlers show tiredness differently. They often get clingy, cry more easily, lose interest in toys, fuss about food, or (counterintuitively) become more active and wired. If your baby has reached this overtired, hyperactive stage, you’ve likely missed the ideal window by 15 to 20 minutes. Getting them down earlier next time usually helps.
Night Feedings and Sleep
Young babies wake at night because they genuinely need to eat. Their stomachs are small, and they burn through calories quickly. A healthy newborn should not go more than five hours between feedings, even if that means waking them up. If your baby routinely sleeps through feeding times, you’ll need to rouse them. As long as they’re feeding regularly, producing around eight wet or dirty diapers a day, and gaining weight, long stretches of sleep are not a concern.
The need for nighttime calories typically fades between 4 and 6 months for formula-fed babies and between 6 and 10 months for breastfed babies. This doesn’t mean your baby will automatically stop waking. Habit, comfort, and developmental changes all play a role. But from a nutritional standpoint, most babies can get all their calories during the day by around 8 to 9 months.
Sleep Regressions
Just when sleep starts to feel predictable, it often falls apart. The most common regression hits around 4 months, when your baby’s sleep architecture matures and they begin cycling through lighter and deeper stages more like an adult. This means more partial awakenings between cycles, and many babies who previously slept well suddenly start waking every hour or two.
A second common disruption arrives around 9 months, driven largely by separation anxiety. Babies at this age become intensely aware that you exist even when you’re not visible, and being alone in a dark room becomes genuinely distressing for them. Other regression triggers include teething pain, growth spurts that create extra hunger, learning new physical skills like rolling or pulling up (babies often want to practice at 2 a.m.), and illness.
Regressions typically last two to six weeks. If your baby is at least 4 months old, sleep training methods can help during these periods, though many families simply ride them out.
Setting Up a Safe Sleep Space
The surface your baby sleeps on matters for safety. Use a firm, flat mattress in a safety-approved crib or bassinet, covered only by a fitted sheet. Nothing else belongs in the sleep space: no blankets, no pillows, no bumper pads, no stuffed animals. These items increase the risk of suffocation.
Temperature is the other key variable. Overheating is a risk factor for sleep-related infant deaths. Dress your baby in one layer more than you’d wear comfortably, and skip hats indoors. If your baby is sweating or their chest feels hot to the touch, they’re too warm. A room temperature comfortable for a lightly dressed adult is generally right.
When Sleep Seems Like Too Much
Parents sometimes worry that a baby is sleeping too much, especially in the newborn phase. Most of the time, a very sleepy baby is simply a very sleepy baby. The key indicators that everything is fine are consistent feeding (at least every five hours for newborns), regular wet and dirty diapers, and steady weight gain.
If your baby is difficult to wake for feedings, seems unusually limp or unresponsive when awake, or isn’t producing enough wet diapers, those are signs worth bringing to your pediatrician. Excessive sleepiness combined with poor feeding can occasionally signal infection, jaundice, or other conditions that need attention, particularly in the first few weeks of life.