Interesting, I was unaware but a quick google search on this subject brought me to the United States Holocaust Memorial Museum website. What I can tell is that the first Holocaust was what they referred to as a "Euthanasia program" which started 2 years prior to the Holocaust that we all studied and learned about in school. It's target was mentally and physically disabled individuals that were living in institutions. This was their first attempt at creating the perfect race. Upon further reading then they targeted children that were handicapped that were not living in institutions and targeted children under the age of 3. They would be sent to "special" clinics and they were killed by overdose or other methods. It's interesting the things you never learn in school.