Ya ya doctor, but not all that comes out of those luscious lips are true.
Exhibit some reliable references and I will agree. As I am offering you.
1) Prior to & during pregnancy, a hearty diet consisting of lots of sugar, rich in nutrients, Na (sodium), Ca (calcium), Vit-C, E, B12 increase chances of having a male child. ~ {study, published in the U.K. journal, the Proceedings of the Royal Society B. Related to: Fiona Mathews of the University of Exeter in England }
Actually this diet tampers the ph level , the acid-alkali balance is taken to an optimum condition which encourages the Y-gened-sperms to flourish easily inside the uterus. (and perhaps hinders the X-sperms?) (actually some sperms even meet the ovum inside the Fallopian tube!)
Ref site.
2) In ayurveda and yoga books some are of opinion that if the blood of the mother is Alkaline during mating, the child will be male; and acidic will lead to female.