An 8-month-old needs 12 to 16 hours of total sleep per day, including naps. Most of that comes in a stretch of 6 to 8 hours at night, with the remaining hours split across daytime naps. That’s a wide range, and where your baby falls within it depends on their nap schedule, how long they sleep overnight, and whether developmental changes are temporarily throwing things off.
Nighttime Sleep at 8 Months
At this age, babies generally sleep 6 to 8 hours at night, ideally in one continuous block. Some babies stretch closer to 10 or 11 hours overnight with a feeding or two mixed in, while others still wake more frequently. Both patterns are normal. The total number of hours matters more than whether they’re unbroken.
If your baby is formula-fed, nighttime waking at this age is unlikely to be driven by hunger. Formula digests slowly enough that a baby over 6 months old typically doesn’t need calories overnight. For breastfed babies, the picture is a bit different: night feeds still play a role in maintaining milk supply, and most breastfeeding guidance suggests waiting until 12 months before actively night weaning.
How Many Naps and How Long
Most 8-month-olds take 2 to 3 naps per day, totaling about 3 hours of daytime sleep. This is a common transition period. Your baby may be outgrowing the schedule that supported three naps, so you might see a mix of two-nap and three-nap days for a few weeks while they adjust.
Ideally, the first two naps of the day are each at least 60 minutes long. If your baby is still on three naps, the last one is typically a shorter catnap of 30 to 45 minutes. Once that third nap consistently gets refused or pushes bedtime too late, it’s time to drop it and shift to a solid two-nap schedule.
Wake Windows Between Naps
Wake windows for an 8-month-old range from 2.5 to 3.5 hours. The first window of the day is usually the shortest, and the last one before bedtime is the longest. A typical rhythm looks like this:
- First nap: about 2.5 to 3 hours after waking up for the day
- Second nap: about 3 hours after the first nap ends
- Bedtime: about 3 to 3.5 hours after the last nap ends
These aren’t rigid rules. They’re starting points you can adjust based on your baby’s cues. If your baby seems wired and fights a nap, the wake window may be too short. If they’re melting down before the next sleep period, it’s too long.
Spotting Overtiredness
An overtired baby is harder to get to sleep, not easier. That’s the frustrating paradox of infant sleep. When an 8-month-old has been awake too long, their body releases stress hormones that make settling down more difficult.
Signs your baby has pushed past their window include clinginess, crying or fussing that escalates quickly, sudden disinterest in toys they normally like, fussiness around food, and a burst of hyperactive energy that looks like they’re not tired at all. That last one catches many parents off guard. If your baby is suddenly bouncing off the walls after being calm, they’ve likely crossed from tired into overtired. Catching the earlier, subtler cues (a brief stare into the distance, rubbing eyes, turning away from stimulation) helps you get ahead of it.
The 8-Month Sleep Regression
If your baby was sleeping well and suddenly isn’t, you’re probably dealing with a sleep regression. Around 8 months, babies go through a burst of physical and cognitive development that can disrupt their sleep for a few weeks. Many are learning to crawl, pull to stand, and sit up independently. Some are teething. Their brains are processing separation anxiety for the first time.
All of this adds up to restlessness at night. A baby who just learned to pull up in their crib may do exactly that at 2 a.m. and then cry because they can’t figure out how to get back down. A baby working through separation anxiety may wake and need reassurance that you’re still nearby. These disruptions are temporary. Most sleep regressions resolve within 2 to 6 weeks without any major changes to your routine. Staying consistent with your existing sleep habits during this period helps your baby return to their baseline faster once the developmental leap settles.
A Safe Sleep Setup Still Matters
At 8 months, your baby is more mobile than ever, which makes the sleep environment worth revisiting. The crib should have a firm, flat mattress with only a fitted sheet on it. No blankets, pillows, stuffed animals, or bumpers. Even if your baby can roll both ways and sit up independently, the same guidelines apply. A sleep sack is the safest way to keep them warm without loose fabric in the crib.
If your baby has started pulling to stand, lower the mattress to its lowest setting so they can’t topple over the railing. Remove any mobiles or hanging toys within reaching distance.
Putting It All Together
A realistic day for an 8-month-old might look like waking around 6:30 or 7 a.m., taking a first nap around 9:30, a second nap around 1:30 or 2, and heading to bed between 6:30 and 7:30 p.m. Total sleep lands somewhere around 13 to 14 hours when you add nighttime and naps together. Some babies naturally run on the lower end at 12 hours, and some need closer to 15 or 16.
The best indicator that your baby is getting enough sleep isn’t hitting an exact number. It’s their mood and energy during wake windows. A well-rested 8-month-old is alert, curious, and engaged with their surroundings. If your baby is consistently irritable, fighting every nap, or waking frequently at night for weeks on end (outside of a regression), adjusting wake windows by 15 to 30 minutes in either direction is the simplest first step.