Growth referenceOpen access
WHO Multicentre Growth Reference Study
World Health Organization · 2006
Normative Research
This is a population-level study. Its data informs the age windows and confidence scores behind our milestone predictions — telling us when most children reach a given milestone, and how much variation exists.
Sample size
8,500
children
Countries
6
Brazil, Ghana, India, Norway, Oman, USA
Age range
Birth
to 5 years
Milestones covered
6
in our corpus
Coverage by age & domain
Each cell shows how many items this source covers in that age band and developmental category. Darker = more coverage.
| 0–12mo | 12–24mo | 24–36mo | 36–48mo | 48–60mo | 60mo+ | |
|---|---|---|---|---|---|---|
| Body | 3 | 1 | ||||
| Curriculum | 2 | 2 |
Domains assessed
Gross motor
How we used it
6 gross motor milestones mapped from WHO growth reference motor windows.
Citation
WHO (2006). WHO Motor Development Study. Bulletin of the World Health Organization.
Developmental milestones (6)
Canonical milestones in our developmental ontology that cite this source.