I'm making a different point.

You argue that post-viability abortions don't happen and that therefore we don't need to worry. (In particular, it shouldn't be illegal.)

I am arguing that parents killing their children doesn't happen and that therefore we don't need to worry. (In particular, it shouldn't be illegal.)

If the latter is not true, then there is also something wrong with the logic in the former.

I am not addressing the blood transfusion analogy here. That's a different argument which I address elsewhere. Here, I'm specifically addressing your claim that women don't try to abort their viable fetuses and that this has some bearing on legality.