https://encyclopedia.ushmm.org/content/en/article/euthanasia...
"On August 18, 1939, the Reich Ministry of the Interior circulated a decree requiring all physicians, nurses, and midwives to report newborn infants and children under the age of three who showed signs of severe mental or physical disability."
"Beginning in October 1939, public health authorities began to encourage parents of children with disabilities to admit their young children to one of a number of specially designated pediatric clinics throughout Germany and Austria. In reality, the clinics were children's killing wards. There, specially recruited medical staff murdered their young charges by lethal overdoses of medication or by starvation."