Swaddle
Usual age
8-10 months
Often lasts
Weeks
Is it a problem?
Normal
Signs of the 8 month sleep regression
- Standing or crawling in the crib instead of sleeping
- Crying when you leave the room at bedtime
- Fighting the third nap, or short naps
- New night wakings after a settled patch
Why it happens
Unlike the 4 month change, there is no single sleep-architecture shift here. It is a cluster of normal developments that tends to land at the same time:
- Motor skills. Crawling, sitting up and pulling to stand are exciting. Babies practice them everywhere, including at 2 am.
- Separation anxiety. Babies now understand that you exist when you leave (object permanence), and they want you back.
- Nap transition. Many babies drop from 3 naps to 2 between 6 and 9 months. During the switch, they can be overtired by bedtime.
- Teething may add to it for a night or two at a time.
What helps
- Practice new skills in the day. Lots of floor time, and practice going from standing to sitting so your baby is not stuck at night.
- Check wake windows. At 8 months most babies do well with 2.5 to 3.5 hours. See the 8 month sleep schedule.
- Make the 3 to 2 nap move if the third nap is a struggle, with an earlier bedtime for a while. Read nap transitions.
- Add connection at bedtime. A few extra minutes of cuddles and a predictable goodbye phrase help with separation anxiety.
- Stay consistent at night. Whatever you choose to do when your baby wakes, doing roughly the same thing each time helps them settle into the new normal faster.
How long does it last?
Usually a few weeks. Once a new skill is mastered and the nap schedule settles, most babies go back to their usual pattern.
When to call your pediatrician
A sleep regression is a normal phase. Call your pediatrician if poor sleep comes with fever, breathing that seems hard or noisy, snoring with pauses, vomiting, a rash, ear pulling with fussiness, fewer wet diapers or poor feeding, or if your baby just seems unwell or unlike themselves. Trust your instincts.
Want the whole day mapped out? See the 8 month old sleep schedule.