The key problem with this discussion is that it's very, very easy to get dragged into arguments about "legalised murder" and, as mentioned, the "value of life". Both are buzzwords that hide incredibly complex arguments and so on, making them easier to utilise in an argument such as this.
If we run on life having a value, we go into the debate of when a child has the full functionings of life and whether it has priority over the already functioning.
If we raise the question of 'the legality/standpoint on the child's death' (bearing in mind legal murder is an oxymoron and unapplicable; murder is
unlawful killing, end of) we begin to raise the question of when a killing is necessary, and the virulent territory of Eugenics, Euthanasia and, of course, abortion, that's a very, very touchy and highly opinionated subject.
I hate to analyse the actual argument rather than proceeding with it, but I feel, as I have constantly iterated, that it is not my choice - while I would defend my child's rights, I would not defend another unborn child's (unless it was a situation of empathy and compassion). It is the mother's choice and I will not stand in the way of that. With this, I feel the other points become moot and we avoid the minefield of opinion.