The technology of genetic engineering has now reached the point where expectant parents may be able to replace a baby's bad genes with good ones in the laboratory. CNN's Brooke Baldwin says the possibilities are tremendously exciting, but a little bit frightening at the same time. Proponents say we can build better babies. Critics fear we might end up "playing God". Brooke discusses the future of so-called "designer babies" with two experts in the field – Jeremy Gruber and Dr. Alan Copperman.