By the WHO growth reference, boys who have just turned 1 have a median height of 75.7 cm (2′6″). Most children (94%) are between 71.3 cm (2′4″) and 80.2 cm (2′8″).
75.7 cm (2′6″)
median height (P50)
71.3–80.2 cm
P3–P97 range
| Age | P3 | P15 | P50 | P85 | P97 |
|---|---|---|---|---|---|
| 1 year | 71.3 | 73.3 | 75.7 | 78.2 | 80.2 |
| 1 year 3 months | 74.4 | 76.5 | 79.2 | 81.8 | 83.9 |
| 1 year 6 months | 77.2 | 79.5 | 82.3 | 85.1 | 87.3 |
| 1 year 9 months | 79.7 | 82.2 | 85.1 | 88.1 | 90.5 |
P50 is the median: half of children the same age are shorter and half taller. P3 to P97 is the range WHO treats as normal.
| Height | Children shorter |
|---|---|
| 70 cm (2′4″) | 0.8% |
| 75 cm (2′6″) | 38% |
| 80 cm (2′7″) | 96% |
| 85 cm (2′9″) | 99.9% |
Values come straight from World Health Organization tables: the WHO Child Growth Standards (2006) for ages 0–5 and the WHO Growth Reference (2007) for ages 5–19. National references (CDC in the US, for example) can differ by a few centimetres. This is not a diagnostic tool: growth over time matters more than a single measurement, and questions about your child's growth belong with their doctor.