@semck, no I don't think it's justified in that case, because a parent of a born child has obligations (legal and personal) to provide for that child which do not exist while still in the womb. Still, I take your point, which is undoubtedly, "well how is THAT distinction not arbitrary?" I'm not sure how to best answer it. I can only say that somehow, the sum total of the reasons becomes more important than "never kill." I think you'd be hard pressed to present a scenario where all of the same factors exist with a 3 year old child. Which brings us back to...
I really need you to address my soldier point. If you can show why making an exception to the "no killing" rule is not arbitrary in that case, but is arbitrary in my case, then I think you will have made the important point. If you cannot, you only show that there exists an arbitrary hierarchy in any morality, which I have acknowledged from the start.
To your husband vs wife argument, I think my response to cyrus adequately addresses that already. Men can kill adult women, women can kill adult men, but only women can give birth. Men are not equipped to fully understand the reality of the situation. We are not the peers of women in this case.
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@fullhamish I too, was surprised how close it was, actually. But a 13 point spread is hardly "nothing." I would love to see these stats in a 1st world nation where abortion is not a key issue - you know, everywhere but US, UK and AU.