Intersexuality
Most of the time, the result of fetal genital development follows the stereotypical male or stereotypical female development path. However, in a small but significant minority of cases, the path of development follows an intermediate or other pathway, leading to what are called "ambiguous genitalia", one condition of those known as intersexuality.
See congenital anomalies of the genitalia for a list of congenital disorders caused by problems with fetal genital development.
Read more about this topic: Fetal Genital Development