Another sufferer - Imhotep.

Except if you look at genetics the gene that determines the child's sex comes from the father at conception. A mother can only give an X gene to the child, fathers can give either an X or Y gene. XX is female, and XY is male (for those of you that forgot high school bio). I guess the food you eat could affect the chemical makeup and therefore pH, which MIGHT affect which sperm make it to the egg, but I doubt it.