Comment Re:There are no Facts (Score 1) 1469
A "human being" - hate to say this, but read Heidegger's "Being and Time" for an understanding of what the human mode of "being" is. (There are also definitions of "child" that distinguish them from "infant," and definitions of "infant" which distinguish them from neonates. We're talking about neonates here.)
The point is that a two-month old baby is more like an eight-month old fetus that it is like a four-month old baby. There is a sense of human self-hood in the latter; there is inter-relationality and inter-subjectivity, there is communication, there is an awareness of social contingencies.
Philosophical, rather than biological, definitions of humanity are necessary here, because we're talking ultimately about ethics.