Baby Growth Calculator

This baby growth calculator gives a rough expected weight and height for an infant's age using common pediatric averages, adjusted slightly by sex. Every baby grows at their own pace, and this is only a general reference — the actual clinical standard used by doctors is the WHO growth chart, which plots a baby's measurements as a percentile against thousands of children rather than a single average figure.

Enter your baby's age in months and sex. The calculator looks up the approximate average weight and height for that age from standard pediatric growth data — if your baby's numbers differ from this estimate, that's usually normal variation, but your pediatrician's growth chart tracking over multiple visits is the reliable way to monitor healthy development.

Approximate averages by age in months.