The failure of so-called “minipuberty” (the surge in luteinizing hormone releasing hormone (LHRH), which triggers a release of LH and an increase in production of testosterone), is common in children with UDT around 2–3 months of age, as shown by Gendrel et al., who found a significantly lower level of LH in children aged 2–3 months with either unilateral or bilateral cryptorchidism [25]. The gene discussed is GNRH1; the disease is cryptorchidism.