A main source for the ages
Many naps, one nap, none: A systematic review and meta-analysis of napping patterns in children 0–12 years
Sally Staton, Peter Sheldon Rankin, Mollie Harding, Simon S. Smith, Emily Westwood, Monique K. LeBourgeois, Karen J. Thorpe · 2019 · Sleep Medicine Reviews
- Children
- Children from 44 studies
- Where
- Europe, North America, Asia and Australasia
- Ages
- Birth to 5 years and over
- How
- A study that pulled together lots of studies, mostly parents' reports
- What it found
- Very few children had stopped napping before 2. About a third had stopped by 3, more than half by 4, and about 8 in 10 by 5.
- Limits
- Studies varied a lot, and most were rated at some risk of bias. No studies from Africa or South America.