How did people not know there were different types? What happened to sex education in schools? Of course they need a different method for, say,very early abortion which can be aborted chemically, and killing and vacuuming out larger foetuses (crude as that sounds that's what they do).
I don't really think disability is a reason to abort a baby- by getting pregnant you're kind of committing yourself to the possibility that you will have a disabled child. If people can't deal with that then maybe they ought not to be having children. Or maybe, instead of conceiving and then killing a child, they ought to think about giving some poor kid in a home a chance to have a loving family. My two cents.