Worldwide, 51 percent of the babies born are boys and 49 percent are girls. Generally speaking, you have a 50/50 shot at having a baby of either gender. Theories abound on how you can conceive a boy or a girl, some of which have some basis in medical fact and others are speculation or unproven.
According to the Shettles Method of conception, timing is everything. Sperm carrying the Y-chromosome that produces males are faster, but die off more quickly than sperm carrying the X-chromosome. Therefore, if you would like to conceive a boy, you should have sex close to your ovulation period to give the faster Y sperm a better chance of fertilizing the egg. Numerous studies have been conducted since Dr. Landrum Shettles published this theory in 1970, and most fertility experts agree that the timing of intercourse has no effect on the gender of your baby, according to FertilityFriend.com.
The Whelan Method
The Whelan Method also uses timing, but it is the opposite of the Shettles method in that to have a boy, you should have intercourse six days before your basal body temperature rises, which indicates ovulation. To have a girl, you would have to have intercourse two to three days before you ovulate. Similar to the Shettles method, most experts agree that the Whelan Method is not valid because timing has little to do with the gender of the infant.
Keep the Sperm Cool
Others claim that if you would like to conceive a boy, your husband should wear boxer shorts. Fertility experts agree that sperm are very sensitive to temperature changes, and the theory is that male sperm are less tolerant to heat. Because briefs hold the testicles close to the body, they kill off sperm containing the Y-chromosome. Some couples go a step further and use cool baths or even ice packs against the testicles to attempt to conceive a son, according to BabyZone.com.
Drink Cough Syrup
Another theory is that drinking cough syrup a few hours before intercourse will help conceive a son. According to this idea, a chemical in some cough syrups, guaifenesin, thins cervical mucus, making the environment in the cervix more hospitable for sperm carrying Y-chromosomes. There is no scientific proof backing this theory, and in fact, most conception experts advise against taking unneeded medications when trying to conceive.