There are 5 preconception methods described for predicting a baby's gender:
1) The Shettles Method claims frequent sports and tight undergarments for men can predict a girl by raising scrotum temperature.
2) Fertility awareness tracking cervical fluid and basal body temperature to time intercourse can utilize sperm characteristics to predict gender.
3) A woman's diet can predict gender, with acidic environments favoring girls and alkaline favoring boys.
4) A woman's orgasm can predict gender, as orgasm creates an alkaline environment favoring boys while absence of orgasm keeps an acidic environment.
5) Sex positions like shallow missionary favor girls while deep positions like doggy style favor boys.