David says, " I shall go to him, but he shall not return to me." This is taken to mean that David will one day go to heaven to be with the child, whereas the child, in heaven, can't return to the Earth.
There's no age of accountability in the Bible. Children aren't innocent up until a certain age. The right to a legal safe abortion should be guaranteed, but each one carries with it the loss of a soul. Then we have it on our conscience.