That may be the way you want to frame the question but others would like to ask "when does it become a human life?" Since the DoI declares that we have an inalienable right to life it is a Constitutional question.
So when does an embryonic human begin life?
i don't see the difference. a couple points though, the DoI is not the Constitution, and a sperm and an egg are both already living. these things aside, if you'd rather replace the word "child" with "human life" for the sake of this argument, i have no problem with that.