An 8-month-old needs 12 to 16 hours of total sleep in a 24-hour period, including naps. That recommendation, from the American Academy of Sleep Medicine, covers infants from 4 to 12 months. Most of that sleep happens at night, with the rest spread across two or three daytime naps.
Nighttime Sleep at 8 Months
Most 8-month-olds sleep roughly 10 to 12 hours overnight, though that stretch isn’t always uninterrupted. A longitudinal study tracking infant sleep across the first year found that about half of infants wake one to two times per night, and roughly a quarter wake more than twice at the 9-month mark. Some babies still benefit from a feeding during the night, often in the early morning hours between 3:00 and 5:00 AM. Others sleep through without one, particularly if they’re taking in enough calories during the day and have learned to settle themselves back to sleep.
How Many Naps and How Long
Most 8-month-olds take two to three naps per day, totaling about 2 to 3 hours of daytime sleep. This is a transitional age, so it’s normal to have some two-nap days and some three-nap days in the same week.
When your baby takes two naps, each one should ideally last at least 60 minutes. On three-nap days, the first two naps are longer and the third is a shorter catnap of about 30 to 45 minutes. As the weeks go on, that third nap tends to drop away naturally.
Wake Windows Between Naps
At 8 months, babies generally do well with 2.5 to 3.5 hours of awake time between sleep periods. A typical rhythm looks something like this:
- First wake window: about 2.5 to 3 hours after morning wakeup, then nap 1
- Second wake window: about 3 hours after nap 1 ends, then nap 2
- Last wake window: about 3 to 3.5 hours after the last nap ends, then bedtime
Wake windows tend to get slightly longer as the day goes on. The shortest one is usually in the morning, and the longest one falls before bedtime. Keeping these windows fairly consistent helps your baby build enough sleep pressure to fall asleep without a long struggle.
Signs Your Baby Is Ready for Sleep
Babies between 6 and 12 months typically show tiredness after 2 to 3 hours awake, which lines up with those wake windows. The cues can be subtle at first: clinginess, losing interest in toys, fussiness around food, or brief bouts of crying. Some babies get more active rather than less when they’re tired, which can be misleading. If your baby suddenly seems wired and hyperactive after being awake for a few hours, that’s often overtiredness rather than a sign they need more playtime.
Catching tired cues early matters because an overtired baby has a harder time settling to sleep. If you notice your baby consistently fighting naps or bedtime, shortening the wake window by 15 to 20 minutes can make a noticeable difference.
The 8-Month Sleep Regression
Around this age, many parents notice a sudden disruption in sleep that had been going smoothly. This is commonly called the 8-month sleep regression, and it’s driven by a burst of physical and cognitive development. At 8 months, babies are learning to crawl, pull to stand, and sit independently. Teething is often underway too. All of that new brain and body activity can create restlessness at night, as babies sometimes practice their new skills in the crib instead of sleeping.
Sleep regressions are temporary. They typically last a few weeks. Keeping your routines consistent through a regression, rather than introducing new sleep habits, helps your baby return to their normal pattern more quickly.
How Daytime Feeding Affects Night Sleep
At 8 months, your baby is eating solid foods alongside breast milk or formula. Getting enough calories during the day plays a direct role in how long they sleep at night. Babies who eat well during daytime hours are more likely to sleep longer stretches overnight, and many families find this is the age where dropping a night feed becomes realistic.
That said, some babies genuinely sleep better with one remaining night feed. If your baby wakes once to eat and falls right back to sleep, that feeding may still be serving a purpose. The goal isn’t to force a particular schedule but to make sure daytime intake is robust enough that nighttime hunger isn’t the thing waking your baby up.
Putting It All Together
A realistic day for an 8-month-old involves about 10 to 12 hours of nighttime sleep plus 2 to 3 hours of nap sleep, landing in that 12-to-16-hour total range. Within that range, there’s plenty of normal variation. Some babies consistently land around 13 hours and thrive. Others need closer to 15. The best indicator isn’t hitting a precise number but whether your baby wakes up in a good mood, stays alert during wake windows, and falls asleep without prolonged difficulty.