Gender selection doesn't sit well with me. Please correct me if I'm wrong, but my understanding of the process is they harvest multiple eggs from mum. These are fertilised and left to develop over a few days. They are then tested for sex. One or two of the desired sex are implanted into mum and the rest are discarded/frozen unlikely to see the light of day.
To me this is creating a life to then terminate it. Whether the egg is 3 days old or 3 months old, that's your baby and your discarding if like rubbish because it's not the gender you want. Obviously your view on this depends in your view on abortion. But it you wouldn't abort a say, 6 week old embryo based on gender, why is it OK to abort a 6 day old, and if you think that's ok, why?