Average Height for a 30-Month-Old Boy

The average (50th-percentile) height for a 30-month-old boy (2½ years) is 91.9 cm (36.2 in), based on the WHO Child Growth Standards. Across the healthy range, most boys this age stand between 85.5 cm (33.7 in) and 98.3 cm (38.7 in). (height is measured standing from age 2)

What's typical at this age

From age 2, height is measured standing, which reads about 0.7 cm less than the same child measured lying down — so a small “drop” from earlier length measurements is expected and normal. Children typically grow 8–9 cm in their third year, the fastest they'll grow for the rest of childhood. Between 2½ and 3 years, the median boy grows about 4.2 cm.

A percentile compares your boy to other boys the same age — the 50th is simply the middle. Being above or below it is usually completely normal; a child who has always tracked the 15th or 85th percentile is typically growing exactly as they should. What pediatricians watch for is a sudden change in the pattern, not the number itself.

Percentiles calculated from the WHO Child Growth Standards (2006). For information only — not medical advice. If you're concerned about your child's growth, speak to your pediatrician or health visitor. Full disclaimer.