Though strong sexual preference for male as first born has now decreased but on a recent survey among expectant mothers and fathers, it was found that almost fifty percent (50%) still prefers to have baby boy.

Both men and women has X and Y chromosomes. As we all know, chromosomes determines the gender of a person. During sexual intercourse, a man can ejaculate around 200 to 400 million of sperms into the vagina; some of these sperms may contain the X or Y chromosomes. On the other end, female egg also contains either X or Y chromosomes. So when a the sperm fertilize the egg, we really can’t choose which sperm and egg to unite to create a male specie.

Though there are some methods to increase the chances of conceiving a baby boy. Pregnancy manuals like Pregnancy Miracle provides tips and information on natural conception and gender selection. Based from Dr. Shettles theory of gender selection, sperm containing Y chromosomes move faster than X chromosome carrying sperm. With this fact, he recommends that couples wondering how to conceive a boy have intercourse no more than 24 hours before ovulation to no more than 12 hours past ovulation.He also believes that deep penetration from your partner will deposit sperm closer to the cervix, allowing the more aggressive Y sperm to get a head start in fertilization.