The daily routine of a 15-month-old

Fifteen months is the heart of the most unstable transition of early childhood: the move from two naps to one.

It does not happen overnight. For several weeks some days call for two naps and others for one, with no apparent logic. That is normal, and trying to impose regularity at this stage only adds tiredness.

The day below shows the two-nap rhythm, the one that still holds most days at this age. On single-nap days the rule is simple, and it is the one that gets forgotten: move bedtime earlier.

Their typical day

Wake-up at

07:00Morning wake-up
awake 3 h
10:00Nap 1 · until about 11:40 (1 h 40)
awake 3 h 25
15:05Nap 2 · until about 16:10 (1 h 05)
awake 3 h 50
20:00Bedtime

Naps: 2
Daytime sleep: 2 h 45
Awake windows: 3 h 30 – 5 h
Night: 11 h

Calculated from the figures for this age. These are starting points, not instructions: your child’s tiredness signals come before the clock.

The awake windows at this age

First window, on waking: 3 h
Between two naps: 3 h 25
Last window, before bedtime: 3 h 50

The first window of the day is the shortest, the last the longest. That holds at every age, and it is what stops you putting down a child who has not built enough sleep pressure yet.

If your baby wakes earlier or later

The whole day shifts. What matters is the gaps between the moments, not the times themselves.

Wake-up at 06:30

Nap 109:30 – 11:10
Nap 214:35 – 15:40
Bedtime19:30

Wake-up at 07:30

Nap 110:30 – 12:10
Nap 215:35 – 16:40
Bedtime20:30

The key point at this age

Holding two rhythms at once

During the transition you do not choose a rhythm: you keep two. On two-nap days change nothing. On one-nap days shift it gradually towards 12.30 – 1 p.m. and put them down thirty to forty-five minutes earlier. This irregularity lasts four to six weeks. It is uncomfortable for a parent who likes to plan, and it is temporary.

The page for this age

When the day goes off the rails

One day two naps, the next only one

That is exactly what the transition looks like, and it lasts four to six weeks. You do not choose a rhythm, you keep two: on two-nap days nothing changes; on one-nap days you shift it towards 12.30 – 1 p.m. and move bedtime thirty to forty-five minutes earlier.

The single nap only lasts an hour

That is common at the start of the transition: the nap only lengthens once it settles, often after two or three weeks. In the meantime an earlier bedtime compensates. If it stays short beyond six weeks, go back to two naps two or three days a week and try again later.

They have been waking at night since the transition started

The sleep debt of this period fragments the nights, and it is the most common symptom. Moving bedtime earlier is the most effective and most underused lever. If the waking persists beyond six weeks, the transition was started too early.

What changes before and after

By age	Naps	Daytime sleep	Bedtime
12 months	2	2 h 30	20:00
15 months	2	2 h 45	20:00
18 months	1	1 h 45	20:00

The questions of this age

How do I know my 15-month-old is ready for one nap?

They systematically refuse one of the two for at least two weeks running, or the morning nap shifts the afternoon one so far that bedtime derails. Three days of refusal is not enough.

When should the single nap fall?

Early afternoon, between 12.30 and 1.30 p.m., for an hour and a half to two and a half hours. If it runs past 3.30 p.m., it will push bedtime back.

My 15-month-old wakes at night since the transition began, is it related?

Yes, very often. Sleep debt during the transition fragments the nights. Moving bedtime earlier is the most effective lever, and the most underused.

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