- When: commonly around 6 months (24–30 weeks), counted from the due date for a baby born early.
- Is it real? The waking is; a “6-month regression” as a brain change isn't. No study shows a sleep change at this age the way there is around 4 months.
- What's usually behind it: the move from three naps to two, rolling and sitting, a first tooth, starting solids, or a cold.
- How long: often 1–3 weeks, usually until the naps settle.
- What helps most: fix the day first. An earlier bedtime while the afternoon stretches out often fixes the night too.
Is the 6 month sleep regression real?
Evidence: loosely documented. The change around 4 months, when sleep matures into adult-like cycles, shows up in sleep recordings. Nothing comparable has been found at 6 months. “The 6-month sleep regression” is a name parents and sleep coaches use for a stretch when several ordinary changes land at once.
What research does show is that night waking at this age is common and normal. In a study of 388 babies, between 28% and 57% of 6- and 12-month-olds weren't sleeping through the night, depending on whether “through the night” meant 6 or 8 hours in a row. Those babies did just as well in mental and motor development as the ones who slept long stretches, and their mothers' mood was no different. The AAP puts it plainly: it is normal for a 6-month-old to wake up during the night and then go back to sleep after a few minutes.
So if your baby slept 7 hours last month and now wakes at 2 a.m., nothing has gone wrong. The useful question isn't whether the regression is real, but what changed this month.
What else is it? How to tell
| Possible cause | What points to it | What to try |
|---|---|---|
| Three naps becoming two | the third nap gets refused or lands after 5 pm; bedtime drifts past 8 pm; early waking | an earlier bedtime for a week or two while the day reshuffles |
| Rolling and sitting | rolling onto the tummy or sitting up in the crib, then crying because it's new | lots of rolling and sitting practice during the day |
| A first tooth | drooling, gum rubbing and irritability for a few days, with a tooth showing up | comfort and patience; symptoms stay inside about 8 days around each tooth |
| Starting solids | new foods in the same weeks as the waking | keep new foods earlier in the day so any tummy trouble isn't at bedtime |
| A cold or other illness | runny nose, cough, fever, ear pulling, feeding less | call your pediatrician if there's a fever, breathing trouble, poor feeding or fewer wet diapers |
About teeth. Teething usually starts between 4 and 7 months, with the two front teeth, upper or lower, first, so it's an easy suspect. A study that followed 125 babies through 475 new teeth found symptoms only in an 8-day window: 4 days before a tooth appeared, the day itself and 3 days after. Wakefulness went up in that window, but overall sleep disturbance didn't, and no symptom showed up in more than 35% of teething babies. A few rough nights around a tooth fit; three weeks of broken sleep usually has another cause.
About rolling. Keep putting your baby down on the back. The AAP says that once a baby can roll both ways, from back to tummy and tummy to back, it's fine to leave them in whatever position they roll into. Keep the crib empty and firm, same as always.
Signs
- Night waking comes back after a few good weeks, often in the second half of the night.
- The third nap gets refused, or naps get short and the late afternoon falls apart.
- Bedtime drifts later, and mornings start earlier.
- Rolling, scooting or sitting up in the crib instead of settling.
How long does the 6 month sleep regression last?
Often 1 to 3 weeks. That figure comes from everyday pediatric advice rather than studies, because there's no single event to measure. In practice it lasts as long as its cause: a tooth is a matter of days, a new skill stops being exciting within a week or two, and the move to two naps takes as long as the new rhythm needs to settle. If the waking drags on for more than a month, look at the day: naps, bedtime and how your baby falls asleep at the start of the night.
What helps
- Fix the day first. Most babies take 2 to 3 naps between 4 and 12 months, and the third nap often goes somewhere around 6 to 8 months. While that happens, the afternoon stretches out, and an overtired baby sleeps worse at night. The nap planner shows wake windows by age and when to switch.
- Use an early bedtime. On days with short or skipped naps, bedtime at 6:30 pm, or even 6 pm, is a fix, not a failure.
- Practice new skills by day. Floor time for rolling and sitting takes some of the novelty out of practicing at 2 a.m.
- Keep the bedtime routine short and the same. In a study of families with babies from 7 months, a simple three-step nightly routine cut the time to fall asleep and the number of night wakings within a few weeks.
- Leave a little room to settle. In a large survey of families, babies whose parents encouraged self-soothing slept longer and in fewer pieces. Pausing a moment before going in lets a brief wake-up end on its own.
What's next
The next stretch parents tend to notice is the 8–10 month sleep regression, when crawling, pulling up to stand and separation anxiety arrive. Unlike the 6-month one, there is some research linking those milestones to worse sleep for a while. If you came here from a rough 4-month patch, the 4 month sleep regression page explains the one change that's permanent. The calendar at the top shows your baby's dates for all of them.
Frequently asked questions
Is the 6 month sleep regression real?
Not as a separate brain change. Research shows sleep maturing around 4 months, but nothing comparable at 6 months. What is real is that night waking at 6 months is common: in one study, 28–57% of 6- and 12-month-olds didn't sleep 6–8 hours straight, with no effect on their development. Around 6 months several changes often come together: the move to two naps, rolling and sitting, teeth and solids.
How long does the 6 month sleep regression last?
Often 1 to 3 weeks, depending on the cause. Teething symptoms last a few days around each tooth, a new skill loses its novelty in a week or two, and the switch from three naps to two can take a couple of weeks to settle.
Is it teething?
Maybe for a few nights. In a study of 475 new teeth, symptoms appeared only from 4 days before a tooth came through to 3 days after. Babies were more wakeful in that window, but overall sleep disturbance wasn't linked to teething. If the bad nights go on for weeks, teeth are unlikely to be the whole story.
Should we drop to 2 naps at 6 months?
If the third nap is being refused or pushes bedtime past 8 pm, it's probably time. Many babies make the switch somewhere around 6 to 8 months. For the first week or two, an earlier bedtime covers the longer afternoon. The nap planner shows both options at this age.
Should a 6 month old sleep through the night?
Many don't, and that's normal. The AAP says it's normal for a 6-month-old to wake during the night and go back to sleep after a few minutes. If your baby wakes hungry, seems unwell or isn't gaining weight, talk to your pediatrician.
My baby rolls onto their tummy at night. Is that safe?
Always put your baby down on the back. Once they can roll both ways on their own, the AAP says you can leave them in the position they roll into, in an empty crib on a firm, flat mattress.
Sources
- Pennestri M.H. et al., Uninterrupted infant sleep, development, and maternal mood, Pediatrics 2018: 27.9–57.0% of 6- and 12-month-olds didn't sleep 6 or 8 hours uninterrupted; no link to development or maternal mood
- HealthyChildren.org (AAP): Getting Your Baby to Sleep
- Macknin M.L. et al., Symptoms associated with infant teething: a prospective study, Pediatrics 2000
- HealthyChildren.org (AAP): When Does Teething Start?
- Nemours KidsHealth: Naps: 2–3 daytime naps at 4–12 months
- Mindell J.A. et al., A nightly bedtime routine: impact on sleep in young children and maternal mood, Sleep 2009
- Sadeh A. et al., Sleep and sleep ecology in the first 3 years: a web-based study, J Sleep Res 2009
- Moon R.Y. et al., Sleep-Related Infant Deaths: Updated 2022 Recommendations for Reducing Infant Deaths in the Sleep Environment, Pediatrics 2022
Spotted a mistake or an outdated figure? Write to [email protected].