Month-by-month sleep guide
21-Month-Old Sleep Schedule
- ⏰ Wake window: 6 hours
- 🍼 Naps per day: 1
- 🌙 Bedtime: 8:30 PM
- 😴 Total sleep: 11–13 hours
Reviewed by the BabyNapCalc Editorial Team — our content is reviewed for accuracy against pediatric sleep guidance (AAP/NSF). This is general information, not medical advice.
Kicking balls and following two-step instructions — the 21-month-old sleep schedule with steady 6-hour wake windows and one reliable nap.
21-month-old sleep at a glance
Typical ranges for 21 months — every toddler is different, so treat these as a starting point.
6 h
Between sleep periods
Typical at 21 months
1
1 nap
Rest of sleep at night
11–13 h
Naps + night combined
Typical for this age
Sample 21-month-old schedule
An example day with a 7:00 AM wake, built from this month’s wake windows. Use the mini calculator above with your real wake time.
1:00 PM – 2:30 PM
Nap 1
About 90 minutes
8:30 PM
Bedtime
End of the day
Sleep at 21 months
Twenty-one months is a sweet spot: the nap transition is a distant memory, wake windows hold steady at 6 hours, and total sleep runs 11–13 hours per day on one nap. Your toddler is kicking a ball, following two-step instructions (“pick up the toy and bring it here”), and stringing words together with growing confidence. Predictable days make for predictable nights.
Wake windows hold at 6 hours
The rhythm is beautifully simple now: 6 hours awake, nap, 6 hours awake, bed. For a 7 AM wake, that means nap around 1 PM and bedtime around 8 PM (after a 1.5–2 hour nap ending ~3 PM, plus 6 hours = ~9 PM — adjust to your nap length; shorter naps mean earlier bedtimes). If your toddler's nap runs long, bedtime naturally lands later; if it's short, bring bedtime forward. The windows matter more than the clock times.
Protecting the midday nap
At 21 months the nap is doing heavy lifting for mood, learning, and night sleep — guard its timing. The most common schedule-wrecker at this age is a nap that slides later and later because mornings are so fun. Anchor lunch before the nap and keep the pre-nap routine short and consistent. A nap starting between 12:30 and 1:30 PM protects an evening bedtime that the whole family can live with.
Milestones: coordination and comprehension
Ball-kicking, climbing with confidence, and genuinely following two-step directions show how far coordination and comprehension have come. Toddlers this age also start testing boundaries at bedtime with creative stall tactics — meet them with a calm, unchanging routine. One useful trick: build your toddler's favorite stall (one more song, one more hug) into the routine itself, so there's nothing left to negotiate for. The 22-month schedule keeps the same 6-hour rhythm as vocabulary keeps exploding.
21-month-old sleep questions, answered
Quick answers to the questions parents ask most about sleep at 21 months.
How many hours should a 21-month-old sleep?
11–13 hours total per 24 hours — typically about 10–11 hours at night plus a 1.5–2.5 hour midday nap.
What is a good schedule for a 21-month-old?
Wake 7 AM, nap 1–3 PM, bedtime 8 PM is the classic. Shift the whole day earlier or later to match your family's natural wake time — the 6-hour windows are what matter.
My 21-month-old takes forever to fall asleep at nap time. Why?
Usually the morning wake window is too short. Make sure a full 6 hours (sometimes 6.25) pass between wake-up and nap time before assuming the nap is in trouble.
Should the nap be capped at 21 months?
Only if it's pushing bedtime unreasonably late. Most 21-month-olds can nap 2+ hours and still sleep well at night, as long as bedtime stays consistent. Watch total sleep across the week rather than micromanaging any single day.
This page is a planning guide based on general pediatric sleep guidance, not medical advice. Every toddler is different — talk to your pediatrician with concerns about your child’s sleep.