Depends on the disability.

Not having a child based only on the child being deaf (who shouldn’t really suffer, but could if never given support) is very different than not having a child because they have something that will cause them immense pain and a death within days or weeks of being born. Then there is a massive spectrum between the two.

It depends, but some a child can also suffer for their entire life if they are born healthy but abused and neglected there will always be reasons for having or not having a child. Having the choice whether or not to carry a pregnancy to term is the important thing, and being denied that choice is wrong.