The 8 month sleep regression: separation and new skills

The 8 month sleep regression covers roughly 8 to 10 months, about 35 to 43 weeks, and is one of the most common regression windows, though not every baby has it. Two things meet here: separation anxiety, which tends to peak around 8 to 9 months, and new skills like crawling and pulling up to stand. The skills part usually settles in 1 to 2 weeks; separation anxiety can take longer.

8 to 10 months is the third common window

4m

6m

8–10m

12m

18m

2y

birthage 2

1. 4 months
2. 6 months
3. 8–10 months crawling, separation
4. 12 months
5. 18 months
6. 2 years

About 35 to 43 weeks old. Not every baby has it.

What causes the 8 month sleep regression?

Two causes meet here

1. 1 Separation Your baby now notices when you leave, and wants you back. Bedtime goodbyes get harder.
2. 2 New skills Crawling and standing are so new that your baby practices them in the crib at night.

Separation. Separation anxiety tends to start around 6 months and peak around 8 to 9 months. Your baby now knows you still exist when you leave the room, and wants you back. Bedtime goodbyes get harder, and a waking between sleep cycles is more likely to end in a call for you. Changes like a return to work, a new caregiver or starting daycare can add to it.

New skills. Crawling, pulling up and standing are so new that many babies practice them in the crib at night. Research backs this up. In one study of babies between 5 and 8 months, those who were already crawling had more bedtime difficulty and more night waking than those who weren’t. Studies that followed babies through these months found a rise in broken sleep around the time crawling began, and, for babies who pulled up to stand by 8 months, around that milestone too.

The 8 to 10 month window is the third of the six common sleep regression ages: 4 months, 6 months, 8 to 10 months, 12 months, 18 months and 2 years. It comes after the 6 month regression and before the 12 month one.

Why does my baby stand in the crib at night?

Because pulling up is new, and many babies can get up long before they know how to get down. A baby stuck standing calls for help, gets laid down, and pops straight back up.

• Practice getting down in the day. Several times a day, help your baby lower from standing to sitting: bend the knees, hands to the floor. Once they can do it on their own, the crib stops being a trap.
• At night, help once, then step back. Lay your baby down calmly, once, and let them work it out. Repeating it every time turns it into a game that’s more fun than sleeping.
• Expect it to pass. Most babies tire of the standing within a few days, often as soon as they can sit back down.

How long does the 8 month regression last?

The new-skills part usually settles in 1 to 2 weeks, often once the skill is mastered. Separation anxiety runs on a longer clock: a phase of extra anxiety often lasts several months before it eases, gradually rather than all at once. If sleep is still very rough after about a month with no new skill or change at home, look for another cause.

What helps

1. Practice separation in the day. Short separations of two or three minutes, leaving the room and coming back, help your baby learn that you return.
2. Keep the goodbye the same. The same short routine and the same goodnight line every night make leaving predictable. Much of what looks like bedtime separation anxiety is a baby who can’t yet fall asleep without you, and whatever helps your baby fall asleep at bedtime is what they look for at each waking.
3. Fit the day to the age. Most babies are comfortable awake for about 2 to 3 hours now, with up to 3.5 hours before bed by 8 months, and 3 to 4 hours by 9 to 12 months. Many are finishing the move from three naps to two. An overtired baby has a harder time settling at night.
4. Let new skills happen in the day. Plenty of floor time to crawl and pull up makes the crib less of a practice space.

Night feeds at this age range widely: from none to two a night is typical at 6 to 9 months, and none to one at 9 to 12 months, with some babies feeding more. One or two night wakings are still common through the first year.

Behavioral: keep your routine and your response steady, and comfort without adding a new way of falling asleep you would later need to undo. Responsive: give more closeness through the rough patch, by day and at bedtime, and keep your night response consistent so each waking meets the same calm answer.

In tiho you can log each night waking with a reason (feed, comfort, pacifier and so on), so after a week you can see whether the wakings are hunger, comfort or something new.

Where the advice differs. One view holds that separation anxiety around this age causes much of the night waking, so closeness and predictable goodbyes are the fix. Another holds that it doesn’t cause sleep problems by itself, and that better-rested babies become less fearful, so the timing of naps and bedtime comes first. Both agree on a steady routine. tiho starts with the timing and reads your baby’s own log for the rest.

Is it the regression or teething?

They can overlap. In a large study that tracked babies daily from 4 months to their first birthday, teething symptoms such as irritability and wakefulness clustered in the 4 days before a tooth came through to the 3 days after. Teething tends to explain a few rough nights, not weeks.

When to talk to your pediatrician

Check in if new wakings come with fever, ear pulling, poor feeding, fewer wet diapers or unusual sleepiness, if your baby snores loudly or seems to pause in breathing, or if sleep is still very disrupted after a few weeks with no new skill, illness or change to explain it.

Related reading

• Sleep regressions by age
• The 6 month sleep regression
• The 12 month sleep regression
• Wake windows by age: the cheat sheet