Mishnayos Zavim Perek 2 Mishnah 1

All persons become unclean through zivah, even converts, even slaves whether freed or not, a deaf-mute, a person of unsound senses, and a minor, a eunuch whether [he had been castrated] by man, or was a eunuch from [the time of seeing] the sun. With regard to a tumtum and an androgynous [person], they place upon him the stringencies for a man and the stringencies for a woman: they defile through blood like a woman, and through eggy [substance] like a man. Their uncleanness still remains in doubt.