http://www.actionbioscience.org/biotech/agar.html

Designer Babies: Ethical Considerations
Nicholas Agar

In 2004 the word designer baby went to the dictionary. There are two of the main questions that deals with the designer baby topic. The first is "Are the technologies of genetic modification and selection safe enough to be used on humans" and the second question is "Even if the technologies are safe, can they be morally defended?" There are many geneticists that have been doing experiments involving mice. There are many safety concerns for the technology. One of them is disrupting one of the genes that is beneficial for survival. The process is also very expensive. Pre-implantation genetic diagnosis is not a risk free procedure too. Cloning is also an alternative method and this could lead to parental preference for an enhanced child.