The main aim of this multicenter study, carried out in 7 French university hospitals, was to compare the hormonal profiles (LH, FSH, T, AMH, INHB) of 138 boys aged 0 to 12 months with cryptorchidism and/or micropenis, according to final diagnosis [isolated CHH (iCHH) or CHH as part of combined pituitary hormone deficiency (CPHD), idiopathic minor genital anomaly] and age (1-4 days, ie, during maternity stay, during early mini-puberty between 15 days and 2 months, during late mini-puberty between 2 and 6 months, and between 6 months and 1 year). The gene discussed is BRD2; the disease is Micropenis.