I hear this a lot, and it's currently a popular "wedge scenario" pro-abortion advocates are using to try to convince people that abortion shouldn't be outlawed.
But I think it's largely a red herring. Either the baby is still alive, or it's not. A high view of human life rules out all intentional taking of life, including assisted suicide. It would also rule out these types of abortions, as they are taking life at a time when life would not end naturally.
Valuing human life highly means accepting that while some people are different, we are all equally valuable -- even those who have birth defects or who die as an infant. And people with Down's syndrome are as equally valuable as those who don't.
If you’re concerned about people terminating fertilized cells as a means for genetic selection, you should rather turn your attention to IVF.
Which is fine if the baby is dead or there's a complication in which the mother's life is in immediate danger.
> you should rather turn your attention to IVF.
Agreed, that is a serious ethical issue, and yes it's morally equivalent to abortion. However, I'm afraid there aren't enough people who agree with my stance to make a difference (maybe I'm wrong?)
As stated in my first comment, the politicians currently running for office in my area do not agree with your viewpoint, as they have insisted that they will ban abortion even in the case of fetal death or to save the life of the mother. This, imo, is the anti-abortion purity spiral.