Even more ironically, the Nazis performed sex-change operations on children.

Dr. Mengele had an unlimited supply of human beings which could be used as guinea pigs at his disposal, and commanded absolute power over their lives. One of the experiments he pursued was transsexual operations. He hypothesized that, by surgically transplanting the reproductive organs of people, he could force a sex changes between the subjects. Simon Wiesenthal recounts in his memoirs a story about a boy who underwent such a surgery: “I met another man whom the scientists of Auschwitz, after several operations, had successfully turned into a woman. He was then thirteen years old. After the war, a complicated operation was performed on him in a West German clinic. The doctors restored the man’s physical masculinity, but they couldn’t give him back his emotional equilibrium.” Most of the victims of these sex change experiments died from the grisly operations performed without anesthesia

https://scripties.uba.uva.nl/document/650453