I don't know.
I personally think that messing with these things could lead to a lot of pain to animals. If they screw something up, and it turns out bad, I really don't like that.
Also, this really bothers me about what it could do to humans. In the future if you decide to genetically modify your baby to be blond, strong, athletic, green eyed, you end up with a super race which instantly forgoes a new reason of prejudice and hate... on everyone that wasn't genetically modified.
What's even worse about this, is when people start messing with diseases. If you look at what has evolved already disease wise, all of the antibiotics are slowly becoming useless towards more and more types of bacteria as they become immune and mutate into something new.
This has a record with many types of diseases, bacterias, viruses..
If we genetically remove all of the birth diseases, something new will come. Something will mutate so that it can't be genetically removed, and it will be much worse to the point where theres no stopping it, and it can't be treated nearly as well as the previous diseases.

Wow I went slightly off topic.. but there you go. It's not all guaranteed scientific stuff, but it's a large possibility, one I would personally not like to create or take a chance for my grandchildren.