By the WHO growth reference, boys who have just turned 9 have a median height of 132.6 cm (4′4″). Most children (94%) are between 121.3 cm (4′0″) and 143.9 cm (4′9″).
132.6 cm (4′4″)
median height (P50)
121.3–143.9 cm
P3–P97 range
| Age | P3 | P15 | P50 | P85 | P97 |
|---|---|---|---|---|---|
| 9 years | 121.3 | 126.3 | 132.6 | 138.8 | 143.9 |
| 9 years 3 months | 122.4 | 127.6 | 133.9 | 140.2 | 145.4 |
| 9 years 6 months | 123.5 | 128.8 | 135.2 | 141.6 | 146.8 |
| 9 years 9 months | 124.7 | 130 | 136.5 | 143 | 148.3 |
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 |
|---|---|
| 115 cm (3′9″) | 0.2% |
| 120 cm (3′11″) | 2% |
| 125 cm (4′1″) | 10% |
| 130 cm (4′3″) | 33% |
| 135 cm (4′5″) | 66% |
| 140 cm (4′7″) | 89% |
| 145 cm (4′9″) | 98% |
| 150 cm (4′11″) | 99.8% |
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.