short stature

Short stature simply means being notably shorter than other people of the same age and sex, low enough on the growth chart to stand out. It is a description, not a diagnosis, and most short children are perfectly healthy.

Statistically it is usually defined as a height below the third percentile, or more than two standard deviations below the mean for age and sex. Plotting a child's height on a standardized growth chart is the first step in deciding whether shortness is a normal variation or a sign of a problem.

The causes span a wide spectrum. The most common are non-pathological: familial short stature (short parents, short child, normal growth rate) and constitutional growth delay (a late bloomer). Pathological causes include chronic illness, malnutrition, genetic syndromes such as Turner syndrome, skeletal dysplasias, and endocrine disorders like growth hormone deficiency or untreated hypothyroidism.

The most informative clue is not the height itself but the growth velocity: a child who is short but growing at a steady, normal rate is reassuring, whereas a child whose growth is slowing and crossing downward across percentile lines deserves investigation, even if not yet very short. Bone age and a targeted workup then help pin down the cause.