Most 8-month-olds need 12 to 16 hours of total sleep per day, including 9 to 12 hours at night and two daytime naps. If your baby was sleeping well and suddenly isn’t, or if you’ve never quite gotten into a rhythm, this is one of the most common ages for sleep to fall apart. The good news: the causes are predictable, and the fixes are straightforward.
Why Sleep Falls Apart at 8 Months
Eight months is a collision of developmental milestones. Your baby is likely learning to crawl, pull up, and sit independently. These new physical skills create restlessness at night because babies literally practice movements in their sleep space, sometimes pulling themselves to standing in the crib and then not knowing how to get back down. Teething often overlaps with this period too, adding discomfort on top of excitement.
The bigger disruption for many families is separation anxiety, which often starts or intensifies right around 8 months. If your baby screams the moment you step away from the crib, this is likely the reason. They now understand that you exist even when you’re not visible, but they haven’t yet learned that you always come back. This makes falling asleep alone feel genuinely distressing for them, even if it didn’t before.
This combination of physical, cognitive, and emotional development is sometimes called the 8-month sleep regression. It’s not a permanent change. Most babies move through it within a few weeks, especially with consistent routines.
Build a Predictable Bedtime Routine
A consistent nightly routine is one of the most effective tools for improving infant sleep, and the evidence behind it is strong. In a study of infants whose mothers followed a simple three-step routine (bath, massage, then quiet activities like cuddling or singing) with lights out within 30 minutes, researchers saw significant improvements in how quickly babies fell asleep, how often they woke at night, and how long those wakings lasted. Mothers also rated their baby’s sleep and morning mood as better.
The specific activities matter less than the consistency. What you’re doing is giving your baby’s brain a series of signals that sleep is coming. A routine might look like this: a warm bath, a fresh diaper and pajamas, a feeding, a short book or lullaby, then into the crib drowsy but awake. Keep the whole sequence to about 20 to 30 minutes, and do it in the same order every night. Dim the lights during the routine so your baby’s body starts producing sleep hormones naturally.
Get the Schedule Right
At 8 months, wake windows (the time your baby stays awake between sleep periods) should run about 2.5 to 3.5 hours, gradually stretching as the day goes on. A typical schedule looks like this:
- First nap: about 2.5 to 3 hours after morning wake-up
- Second nap: about 3 hours after the first nap ends
- Bedtime: about 3 to 3.5 hours after the second nap ends
If your baby is fighting bedtime, the most common culprit is that the last nap ran too late or too long, and they simply aren’t tired enough. On the flip side, an overtired baby who missed a nap or stayed awake too long will often fight sleep harder, not less. Their stress hormones spike, making it paradoxically more difficult to settle. Watching the clock for those wake windows helps you hit the sweet spot.
Two naps per day is standard at this age. Some babies try to drop to one nap around 8 or 9 months, but this is almost always a false signal driven by the sleep regression. Stick with two naps until closer to 12 to 15 months.
Night Feedings: Still Necessary?
By 8 months, many babies can go through the night without eating, but this varies by feeding method. Formula-fed babies typically need zero to one feeding per night at this age, and most are ready to drop nighttime feeds entirely. Breastfed babies may still need zero to three feeds per night, partly because breast milk digests faster.
The key factor is whether your baby gets enough calories during the day. If they’re healthy, gaining weight well, and eating solid foods alongside breast milk or formula, experts suggest this is an appropriate window to start weaning off nighttime feeds. That doesn’t mean you have to. But if your baby is waking four or five times and only nursing for a few minutes each time before falling back asleep, hunger probably isn’t the driver. They’ve likely developed a feed-to-sleep association, where nursing or a bottle has become the only way they know how to fall back asleep between sleep cycles.
Putting Baby Down Awake
This is the single most important habit for long-term sleep success. Babies cycle between light and deep sleep roughly every 45 to 60 minutes. Every time they enter a light phase, they briefly rouse. If they fell asleep being rocked or fed, they wake up in a completely different situation (alone, in a still crib) and cry for you to recreate the original conditions. If they fell asleep in the crib on their own, they’re more likely to roll over and drift back to sleep without help.
Putting your baby down drowsy but awake means ending your bedtime routine while their eyes are still open, even if barely. The first few nights will likely involve some fussing or crying. This is where sleep training approaches can help.
Sleep Training Options That Work
Sleep training generally involves giving your baby the opportunity to fall asleep independently, with varying levels of parental presence. The most studied approach is graduated extinction, sometimes called the Ferber method. You put your baby down awake, leave the room, and if they cry, wait 2 to 5 minutes before briefly checking in. You don’t pick them up. You offer a pat or quiet words, then leave again. Each time, you extend the interval by a few minutes until they fall asleep.
In a randomized trial of 235 infants (average age 7 months), sleep training cut severe sleep problems dramatically: only 4% of trained babies had severe sleep problems compared to 14% in the control group. The number of babies waking two or more times per night dropped from 60% to 31%. Parents also reported less fatigue and better mood. Most families see improvement within one week.
A larger study of 328 families found that the benefits persisted. At 10 months, fewer mothers in the sleep training group reported infant sleep problems. By age 2, mothers who had done sleep training reported fewer depression symptoms (15% vs. 26%). Sleep training doesn’t just help babies. It helps the whole household.
If graduated extinction feels too intense, you can try a more gradual approach: sit in a chair next to the crib while your baby falls asleep, then move the chair farther away each night until you’re out of the room. This takes longer but some parents find it more manageable emotionally. The core principle is the same across all methods: your baby needs practice falling asleep without being held, rocked, or fed.
Handle Teething Pain Before Bed
If your baby is drooling heavily, chewing on everything, has red or swollen gums, and is fussier than usual, teething is probably contributing to poor sleep. Before bed, you can gently rub their gums with a clean finger or cool, damp washcloth. Offering a solid rubber teether during the bedtime routine can also help relieve pressure.
Avoid teething necklaces made of amber, silicone, or wood, which pose choking and strangulation risks. Skip numbing gels containing benzocaine, as well as homeopathic teething tablets. If your baby seems truly uncomfortable, ask your pediatrician about an appropriate dose of infant pain reliever before bedtime on the worst nights.
Set Up the Sleep Environment
Keep the room between 68 and 78 degrees Fahrenheit, with a fan on low for air circulation and white noise. Darkness matters: use blackout curtains if streetlights or early sunrise are an issue. The crib should have a firm, flat mattress with only a fitted sheet. No blankets, pillows, stuffed animals, or bumpers. Your baby should sleep on their back in their own sleep space, not on a couch, armchair, or in a swing.
At 8 months, many babies roll to their stomachs during sleep. If your baby rolls on their own, you don’t need to keep flipping them back. Just always place them on their back at the start of each sleep period.
When Separation Anxiety Peaks at Night
If your baby is suddenly hysterical when you leave the room, lean into connection during the day rather than changing your nighttime approach. Extra floor time together, peek-a-boo games (which teach the concept of “gone and back”), and calm, confident goodbyes at naptime all help build trust that you return.
At bedtime, keep your departure calm and brief. Lingering, tiptoeing out, or sneaking away once they’re asleep can actually make anxiety worse because it becomes unpredictable. A short, consistent phrase (“I love you, goodnight”) followed by leaving the room gives your baby a clear signal. The anxiety typically eases within a few weeks as their emotional development catches up.