I am always slightly amused at the idea of designer babies. On the one hand, we already do this at a more coarse grained level: it's called sexual selection. Yet I don't think adding genetic screening will turn out nearly as well as some people hope.
The relationship between our genes and the high-level traits we care about is complex and non-orthogonal; it will be difficult to isolate the genes for a specific trait without producing unintended consequences. With standard sexual selection we are able to judge by the end result (especially if you can observe the other person's family prior to reproduction, and you see what recessive traits they may possess).
The relationship between our genes and the high-level traits we care about is complex and non-orthogonal; it will be difficult to isolate the genes for a specific trait without producing unintended consequences. With standard sexual selection we are able to judge by the end result (especially if you can observe the other person's family prior to reproduction, and you see what recessive traits they may possess).