What's driving it
Unlike the 4-month regression, this one isn't caused by a permanent shift in sleep cycle architecture. There's no lasting change to how your baby's sleep is structured. Instead, the 8 to 10 month regression is developmental, and it tends to show up because several big things are happening in your baby's world at once.
New motor skills like crawling and pulling up to stand are usually front and center. The trouble is that babies don't limit practicing a new skill to daytime play. The crib is often where a baby first realizes they can pull themselves up to standing, and that same skill gets rehearsed at 2am simply because the muscle memory is fresh and the urge to try it again is strong, regardless of how dark the room is or how tired they are.
Separation anxiety is also peaking around this age, which is a normal part of cognitive development rather than a step backward. Babies are increasingly aware that you exist somewhere else in the house even when they can't see you, and that awareness can make the moment of being put down for a nap or for the night feel more unsettling than it did a month earlier.
For some babies, the early stages of the 2-to-1 nap transition overlap with this same window, adding a third layer of disruption on top of the other two. When all of this lands together, it's no surprise that a previously solid sleeper suddenly seems to be struggling.
Dreamer's weekly insights make it easier to tell whether a rough stretch is part of a developmental regression or an actual schedule problem, by showing nap length and night wakes side by side over time instead of just one hard night in isolation.
What it looks like
The most recognizable sign is a baby standing up in the crib crying, simply because they haven't yet learned how to get back down and lie flat again. This can happen multiple times a night in the early days of this skill, and it's often more about the mechanics of getting back down than genuine distress, even though it sounds urgent over the monitor.
New resistance at separation or bedtime is another common pattern, where a baby who previously settled easily now cries harder or longer when you leave the room. Night wakes can also return after a previously solid stretch of sleeping through, catching parents off guard since it can feel like a step backward after weeks of progress. Naps often shorten during this window as well, sometimes dropping by 20 to 30 minutes from their usual length without any other obvious cause.
See the pattern, not just the bad night
Dreamer tracks naps and night wakes automatically, so you can tell a short-lived developmental regression from a real schedule issue at a glance.
What helps
Practicing the new physical skill during awake playtime helps take some of the novelty out of it at night. Spending extra time during the day helping your baby practice pulling up and sitting back down, ideally with low furniture or your hands as support, means the skill feels less like a thrilling discovery by the time bedtime rolls around.
Brief in-room reassurance tends to work better than picking your baby up every single time they cry. A short visit where you help them sit back down, offer a few calm words, and leave again teaches the skill without creating a new expectation that every wake-up ends in being lifted out of the crib.
Keeping wake windows and naps as steady as possible, rather than overhauling the schedule in response to a few hard nights, gives your baby's body the consistency it needs while it adjusts to everything else that's changing. This is not the time to start a nap transition or move bedtime around if you can avoid it.
A consistent goodbye routine at bedtime and before naps also helps ease separation anxiety specifically. The same short sequence of words and actions every time, even something as simple as a particular phrase and a wave, gives your baby a predictable signal that you're leaving but that it's expected and safe.
How long it lasts
Most families see this resolve within 2 to 4 weeks. The timeline tends to track how quickly the new motor skill stops feeling exciting and starts feeling routine. Once standing up and sitting back down becomes old news during the day, the urge to practice it at 2am tends to fade on its own, and sleep typically returns to its previous pattern without any major intervention needed.
Reviewed for accuracy. This guide reflects general pediatric sleep guidance and is reviewed by Dreamer's certified pediatric sleep consultants (CPSCs). It's informational and doesn't replace advice from your child's pediatrician.
Frequently asked questions
Is this the same as the 4-month regression?
No. The 4-month regression comes from a permanent shift in sleep cycle architecture. This one is driven by motor development and separation anxiety instead.
Should I teach my baby to sit back down from standing?
Briefly showing them during the day can help, but most babies figure this out within days to a couple of weeks with practice on their own.
Will sleep training help here?
It's usually not necessary. This phase tends to be short-lived and resolves with consistency in the existing routine.
Why did my baby's nap schedule fall apart during this?
Temporary nap disruption is common during developmental leaps like this one. Hold the schedule steady and it typically self-corrects within a few weeks.