Many couples actually have a preference on the sex of their child. Its not really wrong to have this as long as you are also alright with having a boy, just in case. There are certain ways in which you can naturally increase your chances of conceiving a girl. The Shettles method is based on the concept that sperm containing the Y chromosome moves faster than the X. The basic idea propagated is to have sex everyday from the end of the women's menstrual cycle till the beginning or three days before her ovulation period. Also it is important that the woman not have an orgasm as this can turn her body more alkaline and therefore less receptive.
Another method is the O + 12 that was arrived at by a mother who just had to have a girl after giving birth to 6 boys. Her theory is that if you have sex 12 hours after ovulation then your chances of conceiving a girl are higher. Her 7th child by the way was a girl.
The Whelan method is a contradiction of the Shettles method and primarily says that in order to have a girl child it is best to indulge in sex as close to the time of ovulation as possible. This is a natural and more effective means of conceiving a girl child. There is also what is known as the Chinese Conception Chart which was discovered in a tomb over 700 years ago. The fundamental principle in this is that the child's age is cross-referenced with the mother's lunar age. It is claimed to have 90 per cent accuracy and can easily be found online.
There are a few dietary supplements that could increase your chances of conceiving a girl. For starters you could use more magnesium and calcium supplements in your diet. Taking medication to reduce the amount of cervical mucus is also believed to create a conducive environment for girls to be conceived. But remember that no matter what your plan, its best to discuss things with your doctor before you attempt taking any medication.
And of course to make things interesting you could also do what some popular urban legends tell you do. One is to have sex in the afternoons and that too on even numbered days. Having sex during the full moon increases your chances of getting a girl. Lots of fish and vegetables in your meal with a follow up of a chocolate dessert can help. Try and initiate sex, you could be surprised with the results.