Every baby however, is a potential person. And every person starts out as what you call a "parasite" (just like any animal, that is the way animals come into being. That's the genesis of the person. I'm interested in the person - the life from baby to old man- not its genesis, not one moment of the person. Everything comes about in one way or the other. That is irrelevant.
That's the problem I have with abortion: the baby is indeed viewed as a "thing", as a "moment" and not as the potential person, not as the life, it is.