You can't mean that all of these qualitys [alive, independent, sentient, thinking, feeling -----------with its own memories of interactions with others and its own internalized identity] must be present elese tha autistic , the amneisiac and the very recently born don't qualify as human beings , neither I suppose would the rather stupid.
I believe the autistic meet each and every one of the criteria stated.
The amnesiac as well, to a limited degree, but certainly more than the fetus.
The very recently born meet the test of independence (existing ex utero) and sentient and alive as well. Once the little guy is out of the womb and on his own, he's somebody's baby and he or she has related to other humans, who have a memory of him or her as a viable human being.