I think we should question all changing the way God creates anything. Whenever man decides he can do it better, it results in trouble. When food is homogenized, for instance, it becomes harmful. I don’t understand about the process of choosing a baby but if this is interfering with natural processes, then it will not have good results or be right.
At the same time, God is showing us more and more, especially in the medical field, better ways to treat the body. Some sects say blood transfusions are wrong, for instance, when this doesn’t change any of God’s creation but is truly helping. The problem is in knowing the difference.