Babies aged 4 to 12 months need 12 to 16 hours of total sleep per day, including naps. How much of that falls at night depends on your baby’s age, feeding needs, and whether their internal clock has matured enough to distinguish day from night. For newborns under 4 months, there’s no official recommendation at all, because “normal” sleep varies so widely that researchers haven’t been able to link a specific amount to measurable health benefits.
That said, there are reliable patterns for what to expect month by month, and understanding them can help you stop comparing your baby to someone else’s and start working with your child’s biology instead.
Newborns to 3 Months: Sleep in Short Bursts
Newborns sleep a lot, roughly 16 to 17 hours in a 24-hour period, but they don’t do it in long stretches. Most of that sleep comes in chunks of 2 to 3 hours, scattered evenly between day and night. A newborn wakes to feed just as often at 2 a.m. as at 2 p.m., because their brain hasn’t yet developed the ability to tell the difference.
The reason is biological. The pineal gland, which produces the sleep hormone melatonin, is present at birth but doesn’t begin rhythmic production until at least 3 to 4 months of age. Without that chemical signal, your baby has no internal cue that nighttime is for longer sleep. A circadian sleep-wake rhythm typically starts emerging around the second month of life, but a stable pattern across most babies isn’t detectable until roughly 13 to 15 weeks. So if your 6-week-old treats midnight like noon, that’s not a sleep problem. It’s normal development.
By around 3 months, many babies begin settling into longer stretches overnight, often 4 to 5 continuous hours. That may not sound like much, but after weeks of 2-hour cycles, it can feel like a breakthrough.
4 to 6 Months: Longer Nights Begin
This is the window when melatonin production ramps up and most babies start consolidating their sleep into a longer nighttime block. Total sleep needs remain 12 to 16 hours per day, and a growing share of those hours shifts to nighttime. Many babies in this range can sleep 6 to 8 hours at a stretch overnight, though night feedings are still common, especially for breastfed babies.
Bottle-fed babies may begin dropping night feeds around 6 months. Breastfed babies often continue needing at least one overnight feed well beyond that point, sometimes up to 12 months. This isn’t a failure of sleep training or a sign that something is wrong. Breast milk digests faster than formula, and smaller, more frequent feeds are biologically normal for breastfed infants.
6 to 12 Months: What “Sleeping Through” Actually Means
By 6 months, most babies are capable of sleeping longer stretches at night, and parents often start asking whether their baby should be “sleeping through the night.” The reality is more nuanced than that phrase implies. A good sleeper at this age is not a baby who sleeps 10 hours without waking. It’s a baby who wakes, as all humans do between sleep cycles, and is able to settle back to sleep on their own.
Every baby (and every adult) wakes briefly between sleep cycles. The difference is whether your baby needs your help to fall back asleep or can do it independently. That self-settling skill is what pediatricians are actually talking about when they discuss sleeping through the night. If your 9-month-old wakes at 1 a.m., fusses for a minute, and goes back to sleep, that counts.
Between 9 and 12 months, most babies are getting 10 to 12 hours of nighttime sleep, with the remaining hours filled by one or two daytime naps. But variation is wide, and a baby who sleeps 9 hours at night and naps well during the day may be getting exactly what they need.
Why Sleep Regressions Happen
Just when a pattern seems established, it often falls apart. Sleep regressions are periods of noticeably worse sleep lasting two to four weeks, and they’re common throughout the first year. They’re less about hitting a specific age and more about what your baby is going through at the time.
Growth spurts can add extra night feedings. New physical milestones like rolling over or pulling up can make babies want to stay awake and practice. Teething pain disrupts sleep for obvious reasons. Separation anxiety, which tends to peak around 9 months, can make a previously independent sleeper suddenly need more reassurance at bedtime. Travel, illness, or a change in routine can trigger regressions too. The key thing to know is that regressions are temporary. They reflect development, not a permanent loss of progress.
Signs Your Baby Isn’t Getting Enough Sleep
Since recommended ranges are broad, watching your baby’s behavior during awake hours is often more useful than counting exact hours. In newborns, signs of overtiredness include pulling at ears, clenching fists, yawning, fluttering eyelids, staring into space, and making jerky limb movements or arching backward. A frowning or worried-looking expression is another common cue.
In older babies, the signs shift. You may notice increased clinginess, crying or grizzling, demanding attention, losing interest in toys, fussiness around food, or paradoxically, a burst of hyperactivity. That last one trips up a lot of parents: an overtired baby often looks wired rather than sleepy. If your baby seems to go from calm to manic in the late afternoon or early evening, that’s usually a signal that bedtime needs to come earlier, not later.
Setting Up Nighttime Sleep for Success
Your baby’s sleep environment matters both for safety and for helping their developing brain learn that nighttime is different from daytime. The American Academy of Pediatrics recommends placing babies on their backs in their own sleep space, on a firm, flat mattress with only a fitted sheet. No loose blankets, pillows, stuffed animals, or bumper pads. Avoid letting babies sleep on couches, armchairs, or in swings and car seats (outside of car travel).
Beyond safety, you can support your baby’s emerging circadian rhythm with consistent light and dark cues. Bright, natural light during daytime wake periods and dim, quiet conditions at night help reinforce the cycle their brain is learning to follow. During nighttime feeds and diaper changes, keep lights low and interactions calm. This won’t magically extend sleep stretches in a 4-week-old, but it gives their developing melatonin system the right signals to work with as it matures over those first 3 to 6 months.
Breastfeeding, when possible, is also associated with better sleep outcomes. The AAP lists it among its safe sleep recommendations, in part because breast milk composition changes throughout the day, with higher melatonin levels in evening and nighttime milk, which may help reinforce your baby’s own developing sleep rhythms.