Many couples want to create a designer baby for two reasons:

1. Prevent Disease- PGD can detect genetic disorders in embryos such as huntington's disease and cystic fibrosis. By knowing which embryos contain disease carrying genes doctors are able to select the healthy embryos for implantation. This allows couples to have a healthy child.

2. Genetic Enhancement- Many parents want the perfect child. They want to be able to choose what they will look like as well as other characteristics such as intelligence and athletism. Today, this is not yet possible, however, technology and our knowledge of genes continues to advance at a fast rate, raising concerns about our future.