The sleep of a 9-month-old baby

At nine months the rhythm looks good on paper: two solid naps, ten to twelve hours at night. What disrupts sleep is no longer sleep — it is everything your baby is learning to do during the day.

Pulling up to stand, crawling, first steps along the sofa: every new skill gets replayed at night for a few days. The brain rehearses what it has just learned, including at 2 a.m., and the body follows.

It is frustrating, but it is short. And unlike the four-month shift, it really does pass.

Sleep per 24 h

11 – 14 h

Of which at night

10 – 12 h

Naps

Awake window

3 h – 4 h

One cycle lasts

~ 60 min

Before putting down

~ 12 min

The key point at this age

Waking before 6 a.m. comes from a bedtime that is too late

This is the most useful counter-intuitive point at this age. A child who wakes at 5.30 a.m. was almost always put to bed too late, not too early. Overtiredness fragments the end of the night, the stretch where deep sleep has already gone. Moving bedtime thirty minutes earlier for a week fixes a good part of early waking — and it surprises people every time.

Your baby’s age

Birth1 year2 years3 years

They fell asleep at

You’re looking at

They fall asleep

Their night at 9 months, minute by minute

The whole night, at a glance

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The timer: when can I put them down?

Start it the second they fall asleep in your arms.

Your baby’s age

While you wait, keep them against you and try not to move. The countdown will tell you when their sleep is deep enough for the transfer.

Keep this tab open. The timer stays accurate even if the screen turns off.

A steady rhythm, unsettled by movement

Two solid naps and long nights. The main disruptor is no longer sleep itself, but everything your baby is learning to do during the day.

Standing up, walking, first words: every new skill gets replayed at night for a few days.
The morning nap starts to shorten, the first sign of the move to a single nap.
Bedtime often settles between 7 and 8.30 p.m., about three and a half hours after the end of the last nap.
Waking before 6 a.m. almost always comes from a bedtime that is too late, not too early.

The classic trap

Do not drop the morning nap too soon. Before twelve months, accumulated tiredness degrades nights rather than improving them.

Falling asleep alone at this age

✓ Possible

Put down awake after their routine, they fall asleep alone. On evenings after a new skill, they will spend a quarter of an hour practising standing up in the cot first.

Put down awake, a child of this age usually takes 10 to 20 minutes to fall asleep. That squirming is normal.

How much sleep they need, age by age

The shaded band is the normal range over 24 hours. Hover to read an age range.

Total sleep over 24 hOf which at night

Hover over the curve to read an age range.

The questions of this age

How many naps at 9 months?

Two, one in the morning and one in the early afternoon, for about three hours in total. The morning nap sometimes starts shortening: that is the first, still distant, sign of the move to a single nap.

My nine-month-old stands up in the cot and cries — what do I do?

Help them sit back down calmly, without turning it into a game, and repeat as many times as needed. During the day, practise the way down: most babies can get up long before they can get back down, and that is what blocks them at night.

Does a nine-month-old still need a night feed?

Nutritionally, usually not — but that stays a question for your GP, particularly if weaning started slowly or weight is being monitored.

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