Average Weight & Height for a 2-Year-Old (24 Months)

Growth at 2 Years

At 2 years, children have typically quadrupled their birth weight and grown about 35 cm (14 in) since birth. The average 2-year-old boy weighs about 12.7 kg (28 lb) and stands 86.5 cm (34 in) tall. Girls average about 12.1 kg (26.6 lb) and 85 cm (33.5 in).

The Half-Height Rule

An old guideline suggests that a child's height at age 2 is roughly half their adult height. While not perfectly accurate, it gives a reasonable estimate. For a more precise prediction, try our height predictor, which uses the Khamis-Roche method accounting for parental heights.

BMI Tracking Begins

Starting at age 2, pediatricians begin tracking BMI-for-age in addition to weight and height. A BMI between the 5th and 85th percentile is considered healthy weight. Below the 5th is underweight; above the 85th is overweight. Use our BMI-for-age calculator for a personalized assessment.

Switching to Standing Height

At 2 years, doctors switch from measuring recumbent length (lying down) to standing height. Standing height is typically about 0.7–1 cm shorter than recumbent length, so you may notice a small apparent decrease — this is not actual shrinkage, just a measurement change.