Average Length for a 7-Month-Old Boy

The average (50th-percentile) length for a 7-month-old boy is 69.2 cm (27.2 in), based on the WHO Child Growth Standards. Across the healthy range, most boys this age measures between 65.1 cm (25.6 in) and 73.2 cm (28.8 in). (length is measured lying down until age 2)

What's typical at this age

Growth in length continues steadily at roughly 1–1.5 cm a month as babies become more mobile. Length still tracks its own curve — a baby who has always been long or short is usually just that. Between month 7 and month 8, the median boy grows about 1.4 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 baby 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.