This study assessed the effects of repeated courses of antenatal corticosteroids on biometric characteristics, salivary cortisol, and heart function in children 6 to 10 years of age using a retrospective cohort study. Twenty-nine children whose mothers had received two or more courses of antenatal corticosteroids were identified from hospital charts. Eighty-seven children whose mothers did not receive antenatal corticosteroids were frequency matched with the exposed group by child's age, sex, and ethnicity. The body development, heart function, and salivary corticosteroid level were evaluated at 6 to 10 years of age. The percentiles of body measurements were calculated based on the 2000 Centers for Disease Control and Prevention growth charts. The general linear models were applied to assess the observed association. Decreased head circumference ( P=0.017) and body mass index (BMI) ( P=0.047) in children 6 to 10 years of age were associated with repeated courses of antenatal corticosteroids. Morning salivary cortisol level was lower in the exposed group than the unexposed group ( P=0.048). No difference was found in height, weight, blood pressure, heart rate, and echocardiogram measurements between the two groups. Repeated courses of antenatal corticosteroid therapy are associated with decreased head circumference, BMI, and salivary cortisol level in children 6 to 10 years of age.