So it's 2am and your baby just woke up for the fourth time tonight. You're checking your phone, looking for answers that don't make you feel like you're doing everything wrong. Here's the thing: there isn't one perfect schedule. But there are ranges, and knowing them can help you figure out whether your baby is actually on track or if something needs a nudge.
Sleep needs change a lot in the first two years. What works for a newborn won't work for a six-month-old, and definitely not for a toddler. The numbers below come from general pediatric guidance. Your baby might be a little above or below the range, and that's usually fine. Having a rough map makes the chaos feel a bit more manageable.
How many hours should a baby sleep by age
Here are the general ranges. Your baby might fall slightly outside them, and that's normal.
- Newborns (0 to 3 months): 14 to 17 hours per day. Yes, that's a lot. They sleep in short chunks, usually 2 to 4 hours at a time, waking up to eat, get changed, and fall back asleep. Night and day barely register yet.
- 4 to 6 months: 12 to 16 hours total, including naps. Most babies take 3 to 4 naps a day at this stage. A lot of parents notice the days start to feel a little more predictable around here, though that can be short-lived.
- 6 to 12 months: still 12 to 16 hours total. Naps drop to 2 or 3. Your baby is getting more mobile, more curious, and often more stubborn about sleeping. This is the phase where you might find yourself on the floor because they absolutely refuse the crib.
- 1 to 2 years: 11 to 14 hours. Most toddlers have 1 or 2 naps, and some start dropping one nap around 15 to 18 months. If your toddler is cranky by 4pm, they might need that second nap still.
Wake windows: how long between sleeps
This is where a lot of parents get tripped up. A wake window is the time your baby can reasonably stay awake before they get overtired. Pushing past that window usually means a fussy, hard-to-settle baby.
- Newborn: 45 to 60 minutes. That's it. They wake, feed, and need to sleep again pretty fast.
- 3 to 6 months: 1.5 to 2.5 hours. The window stretches as they grow.
- 6 to 12 months: around 2 to 3 hours.
- 1 to 2 years: around 3 to 4 hours. Some older toddlers can handle longer, but if they're melting down, they probably need a nap.
Keep a rough eye on how long it's been since the last sleep ended. If you're past the window and the baby is still up, they're probably already overtired. Sometimes the hardest part is getting them down before they blow up.
The sleep regressions nobody warns you about
Around 4 months, 8 months, and 18 months, a lot of babies go through phases where sleep suddenly gets worse. These are often called sleep regressions. They're not a sign you're doing something wrong. They're usually tied to developmental leaps. Your baby's brain is doing a lot of new stuff, and it shows up at bedtime.
The 4-month regression is the one that catches people off guard. Babies start cycling through lighter and deeper sleep the way adults do, which means they wake up more easily between cycles. It can last a couple of weeks to a month or so.
The 8-month mark often comes with separation anxiety and crawling. Your baby might wake up just to make sure you're there. The 18-month regression can overlap with big language and autonomy changes. They suddenly have opinions about bedtime. All three phases pass.
Signs your baby might not be sleeping enough
It's not always obvious when a baby is under-sleeping. Here are some things to watch for:
- Persistent fussiness that doesn't go away with feeding or changing
- Pulling ears, rubbing eyes, or holding the head in a way that suggests tiredness
- Difficulty being comforted, even by people who usually work
- Not gaining weight as expected
- More frequent illness or a generally low-energy baby
Honestly, if you're worried, you're probably right to pay attention. Babies are pretty good at telling you when something is off.
When to talk to a pediatrician
There are a few situations where it's worth a call or an appointment rather than just trying to push through. If your baby seems unusually lethargic during the day, is barely feeding, or is not gaining weight, bring that up with your pediatrician. If night-time sleep has dropped below 5 or 6 hours for a newborn and they're not sleeping enough total, it's worth checking in.
And if you've been reading articles at 3am for the past week and you feel like you're falling apart, that's a reason too. Sleep deprivation is real. You don't have to white-knuckle through it alone.
A few practical things that help
No single trick fixes everything, but a few things tend to make a difference. A consistent wind-down routine, even something simple like a bath and a quiet book, can signal to your baby that sleep is coming. A dark, slightly cool room helps. White noise works well for many babies and some toddlers.
It also helps to have a rough routine without treating it like a rigid schedule. Life is messy. If a nap gets missed, don't spiral. Just adjust the next one. The goal is not perfection. The goal is getting through the night, or at least most of it, and keeping your baby healthy.
If you want a starting point, use the sleep hours and wake windows above as a guide. Then adjust based on what your actual baby tells you. Some nights the routine works. Other nights nothing works and that's also okay. You don't need to get it right every single time.