perfectly select baby gender

A perfectly select baby gender is  wanted by maximum number of the women and if they have fertilization issues on top of it. So they should be more careful in choosing the right one which is perfect for their unborn baby as well as their health.  The science has many remedies for that. But me and my husband are currently looking for the best one since we are really not into those things but as we have no other option we want to be extra careful.