Context: PCOS is a common endocrine–metabolic disorder with strong familial aggregation. It has been demonstrated that parents and brothers of PCOS women exhibit insulin resistance and related metabolic defects. However, metabolic phenotypes in sons of PCOS women have not been described. Objective: To assess the metabolic profiles in sons of women with PCOS during different stages of life: early infancy; childhood and adulthood. Design: Eighty sons of women with PCOS (PCOSS) and 56 sons of control women without hyperandrogenism (CS), matched for age were studied. In early infancy, glucose and insulin were determined in the basal sample. In children and adults, a 2 h OGTT was performed with measurements of glucose and insulin. Adiponectin, leptin, C-reactive protein (CRP), SHBG and serum lipids were determined in the basal sample during the three periods. Results: During early infancy, PCOSS showed higher weight than Cs (p=0.038). During childhood, weight, BMI, waist circumference, total cholesterol and LDL-cholesterol were higher in PCOSS (p<0.05), but after adjusting for BMI, these differences were non-significant. During adulthood, PCOSS exhibited higher weight, BMI and waist circumference (p<0.05). Fasting insulin, HOMA-IR, total cholesterol, LDL-cholesterol and 2 h insulin were also higher and ISI composite significantly lower in PCOSs than in Cs (p<0.05). After adjusting for BMI, only 2 h insulin and ISI composite remained different. Conclusions: The sons of PCOS women exhibit higher body weight from early infancy. In addition, insulin resistance became evident as the subjects got older, which may place them at risk for the development of type 2 diabetes and cardiovascular disease.