We can protect child from illnesses, we can even try to calculate its sign on the zodiac, but the gender... Let it remains a pleasant surprise for parents - in fact it is such exiting moment when the doctor speaks: " So your baby is... ":)
If you look at this question from the point of view of a consumer society why not? We choose a residence, color and style of clothes, brand of the machine and phone... It it's so, why can't we choose child's gender? But... It sounds inhumanly. The child is miracle, treasure, that can't be ordered like a pizza by phone (I want a boy ... And add blue eyes please!).