The birth of son in the family gives it strength and continuity. The couples who desire that a son should be born to them should wear it. This not only helps in birth of a male offspring but also helps in giving his long life and strength.
The Mantra has to be recited on a Rudhraksha mala and should be spoken in such a way that at least you can hear it. Shri Shiv Mahapuran is of the view that Rudhraksha does not give its full results without the use of proper mantras.