The 8–10 month regression: three things at once
Eight months has flattened you, and it is worth knowing why: three separate things arrive within a few weeks of each other, and each one on its own would disturb sleep.
4 min read
The first is motor development. Crawling, pulling to stand and cruising all land in this window, and new motor skills get rehearsed during light sleep. A baby who has just learned to pull up will pull up at two in the morning without meaningfully deciding to.
The second is separation anxiety, which arrives with object permanence: your baby now knows you still exist when you leave the room, which makes bedtime a much larger event than it was. The third is the transition from three naps to two, which leaves a long, difficult late afternoon.
Any one of these produces a rough fortnight. Together they produce the month most parents describe as the worst of the first year.
Take them in this order
Fix the schedule first. The nap transition is the only one of the three you can directly control. Get wake windows right for eight months - two to three hours - and use an early bedtime on the days the day falls apart.
Then support the motor skill. Hours of daytime practice, and specifically practise getting back down from standing. Being stuck upright in a cot at 2am is most of the night waking at this age.
Then soften the separation. A slightly longer wind-down, hiding games during the day, narrated leaving and returning. More reassurance than usual, not less.
Change nothing else. Not the room, not the settling method, not night feeds. Three simultaneous developmental events is the worst possible moment to add a fourth change.
What it looks like
Multiple night wakes in a baby who had been doing longer stretches. Standing in the cot and crying. Naps refused or halved. Bedtime resistance that had never been there. Clinginess in the day, sometimes to one parent in particular.
Teeth frequently join in around now as well, which makes it harder to attribute anything to anything. Do not spend too long on the attribution - the responses above are sensible regardless of which of the three is dominant on a given night.
This isn’t one bad month. It’s three ordinary events that happened to arrive together.
How long
Three to six weeks for most families. It tends to improve in stages rather than all at once - the motor rehearsal settles first, usually once sitting down from standing is automatic; the separation anxiety softens over a longer period; the nap transition finishes on its own timetable.
If you held the schedule and did not introduce new sleep conditions, there is generally nothing to unpick afterwards. If you did introduce something - and many people do, because this month is genuinely hard - unpick it once the dust settles rather than during.
What to do about the wakes themselves
The night waking in this month has an unusual character: your baby is often not distressed, just upright, awake and unable to resolve the situation. That calls for a different response from a normal wake - help them lie down, say almost nothing, and leave.
Doing that repeatedly, in the same dull way, is more effective than staying to settle them properly. A baby who gets a full settling session for standing up has been given a reason to stand up. A baby who is laid down without comment four times, and finds it uneventful each time, generally stops within a fortnight - particularly once they can lower themselves.
Why it feels worse than four months
The four-month change is one thing happening to sleep itself. This is three separate things happening at once to a baby who is also, frequently, cutting teeth. Nothing you fix produces a clean result, because two other causes are still running.
That is worth knowing mostly for morale. Families often conclude at eight months that whatever they did at four months has stopped working, or that they have made things worse. Usually neither is true - the fortnight is simply crowded, and it resolves in stages rather than all at once, which makes the improvement hard to see while it is happening.
When to stop troubleshooting
Fever, ear-pulling, a change in feeding or appetite, a baby who is inconsolable rather than unsettled, or loss of skills they previously had, all mean stopping and calling your GP or health visitor. Ear infections in particular peak in this age range and frequently present as sudden night waking.
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