Your baby can crawl across the room, pull up on the coffee table and wave bye-bye. They also, suddenly, scream when you leave the room at bedtime and stand bolt upright in the crib at 2 a.m. The 8 month sleep regression, which some parents meet at 9 or 10 months instead, is the price of a lot of growing up at once. It’s part of our baby sleep guide by age.
Before anything else, check that the crib is still safe for a mover: mattress at its lowest setting, nothing to climb on, and nothing in the crib. Our safe sleep checklist covers it all.
Is there an 8 month sleep regression?
Many parents notice one, though it isn’t a medical diagnosis. Between about 8 and 10 months, three big changes often arrive together:
| Driver | What it looks like at night | Typical timing |
|---|---|---|
| New motor skills | Crawling around the crib, pulling up to stand and not knowing how to get down | Sitting up by about 9 months; pulling to stand by about 12 months (CDC) |
| Separation anxiety | Crying when you leave, waking and calling for you, wanting one parent only | Second half of the first year (AAP) |
| Nap changes | Fighting the third nap, short naps, overtired evenings | Often in the second half of the first year |
You might see more night wakings, harder bedtimes, early mornings and nap protests. Cleveland Clinic pediatricians note that regressions typically last a week or two, although separation anxiety can ebb and flow for longer.
Crawling, standing and the 9 month sleep regression
New skills are exciting, and babies practice them whenever they can, including at 2 a.m. The CDC’s milestones show most babies get to a sitting position by themselves by 9 months and pull up to stand by 12 months. Many babies can pull up long before they know how to sit back down, so they stand, get stuck and cry.
What helps:
- Practice by day. Give lots of floor time. Help your baby pull up on the sofa, then gently bend their knees so they learn to sit back down.
- At night, stay boring. Calmly lay your baby back down once or twice, say your comfort phrase, and step back. They’ll work it out faster when it isn’t a game.
- Make the crib safe for standing. The AAP advises setting the mattress at its lowest position before your baby learns to stand. Keep bumpers, toys and anything they could climb on out of the crib.
Separation anxiety and sleep
Separation anxiety is a normal, healthy sign that your baby knows who their people are. The AAP describes it as beginning in the second half of the first year, sometimes lasting several months, and usually fading around the second birthday. Your baby may wake and call for you, or want only one parent at bedtime. The CDC lists reacting when you leave (looking, reaching or crying) as a typical 9-month milestone.
How to handle separation anxiety at bedtime
- Keep the routine short and identical. Predictability is reassuring. The same steps, the same order, the same room.
- Say goodbye, don’t sneak out. The AAP suggests telling your child matter-of-factly when you’re leaving, even if it’s only for a minute. Sneaking away can make the next separation scarier.
- Use the same comfort phrase every night. For example: “I love you. You’re safe. I’ll see you in the morning.”
- Check in briefly if needed. Short, calm visits with the same words, then leave again. Keep the lights off and voices low.
- Fill the day with connection. Lots of cuddles and peekaboo games (“I go away, I come back”) help your baby practice separations safely.
Real previews from the app. Play them softly.
Moving from 3 naps to 2
Many babies drop the late-afternoon third nap somewhere in the second half of the first year, and this transition can feed into the regression. Signs your baby is ready:
- They consistently fight or skip the third nap.
- Bedtime keeps sliding later because of it.
- Night sleep or the morning nap gets shorter.
How to make the switch: stretch the time between naps slowly, and move bedtime a little earlier for a week or two to prevent an overtired evening. If you’re ever unsure, follow your baby’s mood: a cheerful baby on two naps is ready.
A familiar sound cue
When everything else is changing, a familiar sound can be a steady anchor. Use the same soft sound every night: white noise, rain or a womb sound. Keep it around 50 dB or lower with the device about 2 m (7 ft) away, never in the crib. See is white noise safe for babies for the details.
Your own voice, even when you’re not there
For babies in a clingy phase, a familiar voice can help, whether it’s you, a grandparent or the parent who’s away on a work trip. With Baby Mantra you can record your own lullaby or a short goodnight message and play it softly inside the mix. Recordings stay on your phone, and the free version includes one.
What comes after the 8 month regression?
Once crawling and standing lose their novelty, sleep often settles. The next common bumps are around 12 months, when cruising and nap refusal can show up (see our 12 month sleep regression guide), and around 18 months. If you’re still feeling the effects of the earlier shift, our 4 month sleep regression guide explains the sleep-cycle change underneath it all.
Sources
- HealthyChildren.org (AAP). Separation Anxiety and Sleeping.
- HealthyChildren.org (AAP). Make Baby’s Room Safe: Parent Checklist.
- CDC. Important Milestones: Your Baby By Nine Months.
- CDC. Important Milestones: Your Baby By One Year.
- Cleveland Clinic. Infant Sleep Regression: What Parents Need To Know.
- American Academy of Pediatrics. Sleep-Related Infant Deaths: Updated 2022 Recommendations for Reducing Infant Deaths in the Sleep Environment. Pediatrics, 2022.
