21 months old: sleep, feeding & development
At 21 months old, you've a busy, curious toddler on your hands. Here's what's typical for sleep, eating and development at this age — every child on their own timeline.
An example day (every baby is different)
- 7:00amWake & first feed
- 10:30amNap 1
- 5:10pmBedtime routine & bed
Feeding at 21 months old
| Stage | Amount |
|---|---|
| Milk feeds | 4–6 / day |
| Typical gap between feeds | 3.5–6h |
| Solids & meals | Alongside milk, building to 3 meals |
Development at 21 months old
What many babies are doing at 21 months old
- Walking well and starting to run
- Two-word phrases
- Simple pretend play
- Following one-step instructions
Read more for this age
Toddler sleep: resistance and big changes
A calm, practical guide to bedtime battles, the cot-to-bed move, night-time fears and saying goodbye to that last nap.
Toddler tantrums
Tantrums are big feelings in a small body learning to cope — and your calm, steady presence is the most powerful tool you have.
Milestones: 12–24 months
This is the busy, beautiful year your baby finds their feet, their first words, and a fierce little will of their own.
Fussy eating in toddlers
Fussy eating is a normal, passing phase for most toddlers — your job is the what, when and where of meals, and theirs is whether and how much.
See your own baby's rhythm at 21 months old
Log feeds, sleep and growth in seconds and Cocoon surfaces wake windows, feeding rhythm and WHO/CDC percentiles for your baby — free and offline-first.
Common questions
How much should a 21 months old sleep?
Around 11–14 hours in total across a day and night is typical for a 21 months old, usually including 1 nap. Sleep needs vary widely between babies — use this as a guide, not a target.
How long should a 21 months old be awake?
Wake windows of about 3h 30m – 5h between sleeps are typical at 21 months old. The first window of the day is usually the shortest. Watch your baby's tired cues rather than the clock.
How often does a 21 months old feed?
About 4–6 milk feeds a day, roughly every 3.5–6h, is common at 21 months old. Feed responsively to hunger cues.
Typical ranges for general information, not medical advice. Every baby is different; if your baby was born early, use their corrected age. For concerns, talk with your doctor or child-health nurse.