[@Penny]Well sure people can choose to abort a fetus, but there is still a very large argument on whether or not that is 'good' and I can see no inherent goodness in choosing traits for kids. 

[quote]Why shouldn't parents who hope for a girl with brown eyes have the option of selecting one?[/quote]
Because the child didn't select it. 

Because it effects the child with no inherent goodness [i]towards[/i] the child. 

Here is my point: Imagine if a parent needs to make a permanent decision about their child. There's two reasonings they would use for their decision. 
1) It is good for the child. 
2) It is good for the parent. 

If you have chosen number 2, that is inherently selfish imo.