Bad idea to ban trait-selected abortion, IMO; but I would just allow it as some people would just do abortion on their own anyway.
This issue can’t just be boiled down to ableism; it is a large reason for the potential abortions. Ableism is a symptom of capitalism. However, some people don’t have the resources to take care of a(n) (autistic) child; some persons got raped and they got pregnant. Is it “ableist” to abort an autistic child then?
Better to abort a baby for traits you don’t like than to treat it badly because of those traits later.
As long as you select for health traits and not aesthetical or others, it should be fine