"Undesirable traits are somewhat subjective. What one person sees as an undesirable trait another person may see as desirable. Also, undesirable traits may not be obvious or perceptible to potential mates, early on or even at all." That's my point because they aren't obvious you have children and see how they fit into society rather than trying to choose through artificial selection. Mother nature, God, the law of the jungle, natural selection whatever you want to claim it is has a much better opinion on who should die than some random chick who got knocked up by accident.
"The rest of your comment doesn't even mention terminating a pregnancy, so it doesn't really tie into that."
Yes, the rest of my comment doesn't mention terminating a pregnancy because it's something unnatural and makes no sense to be a so called "human right".