How long your baby sleeps at night depends almost entirely on age. A newborn might only manage 2 to 4 hours at a stretch, while a one-year-old can often sleep 10 to 12 hours with minimal waking. The shift happens gradually over the first year as your baby’s brain develops the biological clock needed for longer, consolidated nighttime sleep.
Nighttime Sleep by Age
Babies aren’t born knowing the difference between day and night. At birth, they lack a mature circadian rhythm, so their sleep is scattered in short blocks around the clock. Here’s what to realistically expect at each stage.
Newborn (0 to 3 Months)
Newborns need 14 to 17 hours of total sleep per day, but it comes in chunks of 2 to 4 hours because their stomachs are tiny and they need to eat frequently. In the first days, feedings happen every 1 to 3 hours, and you may even need to wake your baby to feed. By about 6 to 8 weeks, some babies start sleeping one longer stretch of 4 to 5 hours, usually in the first half of the night. That longer stretch is a sign that early circadian patterns are forming, which typically begins between 6 and 12 weeks.
3 to 6 Months
Most babies start sleeping through the night around 3 months, though “sleeping through the night” in clinical terms means just 5 to 6 consecutive hours without a feeding. That’s far less than what most parents imagine. By 4 to 6 months, your baby’s brain begins producing more melatonin (the hormone that signals darkness and sleepiness), and sleep cycles start to mature. Total sleep at this age is roughly 12 to 16 hours per day, with nighttime stretches gradually lengthening to 6 to 8 hours. Two to three daytime naps fill in the rest.
6 to 12 Months
By 6 months, many babies can sleep 8 to 10 hours at night, sometimes longer. They still need 12 to 16 total hours of sleep, with the balance coming from one or two naps. Night feedings become less necessary from a nutritional standpoint for most babies at this age, though some continue waking out of habit or comfort. A baby who was sleeping well and suddenly starts waking more often may be going through a sleep regression, which is common around 4 months and again around 9 months when separation anxiety peaks.
1 to 2 Years
Toddlers need 11 to 14 total hours of sleep per day, including naps. Most of that comes at night, with a typical nighttime stretch of 10 to 12 hours. One daytime nap is usually enough by around 15 to 18 months. Night waking still happens, often triggered by teething, illness, or developmental leaps, but at this age most toddlers have the biological capacity to sleep through.
Why Babies Wake So Often
Baby sleep cycles are significantly shorter than adult ones. Where an adult cycles through light and deep sleep roughly every 90 minutes, babies cycle much faster. At the end of each cycle, they briefly surface toward wakefulness. Adults do this too, but we’ve learned to fall back asleep without noticing. Babies often haven’t developed that skill yet, which is why they cry or fuss between cycles, especially in the first few months.
Hunger is the other main driver. In the first weeks, breastfed babies eat 8 to 12 times in 24 hours, and some cluster feed, nursing as often as every hour during certain periods. That feeding schedule makes long stretches of sleep physically impossible at first. As your baby grows and can take in more at each feeding, the gaps between night feeds widen naturally.
Sleep Regressions and Setbacks
Sleep regressions are periods where a baby who had been sleeping reasonably well suddenly starts waking more, fighting bedtime, or refusing naps. They typically last 2 to 4 weeks. The most well-known regression hits around 4 months, when your baby’s sleep architecture is reorganizing into more adult-like patterns. Around 9 months, separation anxiety can cause another wave of disrupted nights.
Regressions aren’t strictly tied to a calendar. They’re more closely linked to what your baby is going through developmentally. A growth spurt may mean your baby needs an extra feeding or two overnight. Learning to crawl, pull up, or walk can also temporarily interfere with sleep. During a regression, your baby may be fussier during the day, take shorter naps, and have trouble settling at bedtime. These phases pass on their own, though they can feel endless while you’re in them.
Signs Your Baby Isn’t Sleeping Enough
It’s not always obvious when a baby is overtired, because the signs can look like the opposite of sleepiness. An overtired baby often becomes more active, not less. Watch for irritability, clinginess, and fussiness with food. In newborns, specific tired cues include pulling at ears, clenching fists, yawning, fluttering eyelids, staring into space, and making jerky arm or leg movements. Older babies and toddlers show it through clumsiness, crying, demands for attention, and losing interest in toys they normally enjoy.
A useful rule of thumb: if your baby has eaten within the last 2 hours and is grizzling and cranky, tiredness is the more likely explanation. Catching these cues early and putting your baby down before they become overtired generally makes falling asleep easier. An overtired baby paradoxically has a harder time settling.
Creating a Safe Sleep Environment
However long your baby sleeps, the setup matters. The American Academy of Pediatrics recommends placing babies on their backs for every sleep, in their own crib, bassinet, or portable play yard with a firm, flat mattress and a fitted sheet. The sleep space should be free of loose blankets, pillows, stuffed animals, and bumper pads. Avoid letting your baby sleep on a couch, armchair, or in a swing or car seat (unless actively traveling in a car). These guidelines apply to naps and nighttime sleep alike.
Room sharing without bed sharing is recommended for at least the first 6 months. This keeps your baby close enough for feeding and monitoring while maintaining a separate, safe sleep surface. Breastfeeding, when possible, is also associated with a lower risk of sleep-related infant deaths.
Helping Your Baby Sleep Longer Stretches
You can’t force a newborn to sleep longer than their biology allows, but you can support the process as their circadian rhythm develops. Expose your baby to natural light during the day and keep nighttime feedings dim and quiet. This contrast helps their brain learn the difference between day and night, which is the foundation for longer nighttime sleep.
A consistent bedtime routine also helps. It doesn’t need to be elaborate. A bath, a feeding, a short book or song, and then placing your baby down drowsy but awake gives them the chance to practice falling asleep independently. Babies who can self-settle at the start of the night are more likely to resettle on their own when they wake between sleep cycles.
Pay attention to wake windows, the amount of time your baby can comfortably stay awake between sleeps. For newborns, that’s only about 45 to 90 minutes. For 6-month-olds, it’s closer to 2 to 3 hours. Putting your baby down within the right window, before overtiredness kicks in, makes the biggest difference in how quickly they fall asleep and how long they stay asleep.