Sodium Bicarbonate

If you want to have a baby boy, start eating more alkaline foods, because Y sperm is shorter than X sperm. Only in an alkaline environment can kill X sperm and let Y sperm live longer, while cyanobacteria is the most alkaline.  So to have a baby boy, you have to eat cyanobacteria.

Cyanobacteria eating method:

Eat 5-10 a day, no time limit.