"Pass me za goot brain, Igor"
This is what you call a human junkyard. Instead of going in for a new axle or battery, you go get a good gene and trash the rest.
Rent the movie Gattaca and you can see what the model of a British designer baby lab is and the social consequences of such a technology.
It's been done in the U.S. In the first case I remember, the parents got IVF but took their chances on whether the baby would be a donor for their teen-age daughter, who had leukemia. I believe they did pre-natal testing, but without any plans for abortion if the baby was not a match, and as luck or the Lord would have it, the baby was and became a marrow donor shortly after birth, saving her sister's life.
In the other case, the parents had the fertilized eggs tested befor implanting, and chose the compatible donor.
Mrs VS