By the WHO growth reference, boys who have just turned 7 have a median height of 121.7 cm (4′0″). Most children (94%) are between 111.8 cm (3′8″) and 131.7 cm (4′4″).
121.7 cm (4′0″)
median height (P50)
111.8–131.7 cm
P3–P97 range
| Age | P3 | P15 | P50 | P85 | P97 |
|---|---|---|---|---|---|
| 7 years | 111.8 | 116.3 | 121.7 | 127.2 | 131.7 |
| 7 years 3 months | 113 | 117.6 | 123.1 | 128.7 | 133.3 |
| 7 years 6 months | 114.3 | 118.9 | 124.5 | 130.2 | 134.8 |
| 7 years 9 months | 115.5 | 120.2 | 125.9 | 131.7 | 136.4 |
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 |
|---|---|
| 105 cm (3′5″) | 0.1% |
| 110 cm (3′7″) | 1% |
| 115 cm (3′9″) | 10% |
| 120 cm (3′11″) | 37% |
| 125 cm (4′1″) | 73% |
| 130 cm (4′3″) | 94% |
| 135 cm (4′5″) | 99.4% |
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.