CHICAGO, Illinois (AP) -- The power to create "perfect" designer babies looms over the world of prenatal testing. But what if doctors started doing the opposite? Creating made-to-order babies with genetic defects would seem to be an ethical minefield, but to some parents with disabilities -- say, deafness or dwarfism -- it just means making babies like them. And a recent survey of U.S. clinics that offer embryo screening suggests it's already happening. Three percent, or four clinics surveyed, said they have provided the costly, complicated procedure to help families create children with a disability. Some doctors have denounced the...