Prenatal testosterone exposure is linked to sexually dimorphic changes in body composition in 7-year-old children.

Context: Maternal free testosterone (FT) increases during 3rd trimester and FT is higher in pregnant women with polycystic ovary syndrome (PCOS) compared to women without PCOS. Higher prenatal androgen exposure has previously been associated with increased catch-up growth in boys.

Objective: To examine associations between maternal 3rd trimester testosterone and body composition in boys and girls.