Published by Actually Sleeping · Reviewed by Dr. Samantha Abrahamson, PharmD · Review policy · Updated 2026-11-10

Sleep at 15 months: what’s normal, what’s hard, and when to get help

At 15 months, the AASM recommends 11 to 14 hours of sleep per 24 hours, including naps. This is prime time for the 2-to-1 nap transition: a large review found two-nap days drop sharply between 12 and 18 months. First steps, new words and strong attachment to a comfort object are all typical, and all can show up at bedtime.

What is changing at 15 months

By 15 months, the CDC lists taking a few steps alone, trying to say one or two words besides “mama” or “dada”, pointing to ask for help, showing affection with hugs and kisses, and hugging a stuffed toy. Toddlers now have opinions, and bedtime is a natural place to express them. Separation anxiety is often still strong; the AAP says it usually peaks between 10 and 18 months.

Nap transition, 2 to 1	What the research shows
When it usually happens	A dramatic drop in two-nap days between 12 and 18 months (Staton 2020)
Naps per day, 1 to 2 years	1.2 on average, spread about 0.4 to 2.1 (Galland 2012)
Total nap time, 1 to 2 years	About 2.3 hours on average among children who nap (Staton 2020)
Stopping naps altogether	Fewer than 2.5% stop before age 2 (Staton 2020)

The 2-to-1 nap switch is where many toddler schedules come apart: two naps make bedtime too late, one leaves your child melting down by 5 p.m. When and how to make the switch depends on your child. Actually Sleeping plans it for your toddler, with Dr. Sam adjusting it with you in daily 1:1 check-ins.

What parents find hardest

The in-between stage. Some days need two naps and some one, so no single schedule fits the whole week.
Daycare on one nap, home on two. Mismatched schedules are common and hard to reconcile.
Bedtime stalling. More words, more requests.
Walking in the crib. New walkers often practise at night for a week or two.

Safe sleep at 15 months

The crib is still the safest bed. The AAP and MedlinePlus give 35 inches (89 cm) tall as the point to move out of a crib, or when the rail is below about three-quarters of your child’s height.
Keep the crib away from windows and the mattress at its lowest setting.
If your child gets attached to a comfort toy, ask your pediatrician about having it in the crib. A sleep sack remains a safe way to keep warm.
No bottle in bed. The AAP advises against it as part of its tooth decay prevention advice.

Night feeds

If your toddler still wakes for milk, ask your pediatrician whether that is needed for nutrition. They decide, and a sleep plan works around their answer.

When to talk to the pediatrician

Snoring on most nights, breathing pauses, or noisy breathing with an open mouth.
Night waking that comes with fever, ear pain or crying that suggests pain.
Your child is not yet taking any steps, not trying any words, or not pointing to ask for things.

Where to go from here

A nap transition planned around your child, with a bedtime to match, is what usually settles this age, and the details differ for every toddler. Actually Sleeping builds that plan for your child, with bootcamp-style coaching before night one. We guarantee that your baby will sleep 8–12 hours through the night within 14 days of consistent, correct implementation of your sleep plan. Parents share their stories on our 12 months and up reviews. Related: nap transitions, daycare naps, and the 12 to 14 month schedule. Book a free consultation with Dr. Sam to start.

Want this fixed for your baby?

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Frequently asked

When should my 15 month old switch to one nap?

When your child consistently refuses or struggles with the second nap and copes well on one. A systematic review found the big drop in two-nap days happens between 12 and 18 months, so 15 months is a very common time.

How much sleep does a 15 month old need?

The AASM recommends 11 to 14 hours per 24 hours, including naps, for children 1 to 2 years old, and the AAP supports this range. Studies found 1 to 2 year olds averaged about 12.6 hours.

Why does my 15 month old fight bedtime now?

New words, new walking and stronger opinions all arrive at once, and separation anxiety is often still strong. Toddlers test whether limits hold. Clear limits that every caregiver holds are what Actually Sleeping builds into a plan for your child.