Child euthanasia (German: Kinder-Euthanasie) was the name given to the organized killing of severely mentally and physically disabled children and young people up to 16 years old during the Nazi era in over 30 so-called “special children’s wards”. At least 5,000 children were victims of the program, which was a precursor to the subsequent murder of children in the concentration camps.

https://en.m.wikipedia.org/wiki/Am_Spiegelgrund_clinic

Hans Asperger, who studied autism, was a doctor who was responsible for determining if these children lived or were put to death/experimented on (knowingly or unknowingly so).