There are many natural ways to influence the gender of the unborn baby. One of them is to use certain sex positions. But, first let's talk about the science behind this idea. Every man produces 2 different types of sperm: the one that carries the X chromosomes (for girls) and the one that carries the Y chromosomes (for boys). The gender of the baby is determined by which type of sperm will reach the egg first. The Y spermatozoa move faster, but are not as strong as the X spermatozoa. This means that all the sexual positions that allow deep penetration will favour the conception of a male child (because the Y spermatozoa are faster and will probably reach the egg first) and all the sexual positions that allow shallow penetration will favour the conception of a female child (because X spermatozoa are more likely to survive long enough to fertilize the egg).
More specifically, here are:
