All myths. the sex of the child is pretty much 50/50, although if the man comes from a family of boys, it seems they tend to have boys also, but if he is the only boy with 3 sisters... he will likely have a very slight chance of having mostly girls also. I'm not a physician, just from experience...my father has 5 sisters and 1 brother and between the 7 of them had 13 children, all girls but 1. This is not the only case like this I've experienced.
I hope you just have a healthy baby either way!
It is a matter of chance. The male sperm contain XY chromosomes and the female egg contains XX chromosomes. If the X chromosome of the male meets the X chromosome of the female the offspring is a girl and if there is a fusion of the XY chromosome then the offspring is a male.However there are also other factors involved like your mental state,your physical state and environmental factors at that time. It is also the pH of the vagina at that time an acidic pH helps in the mating of X-X chromosome while an alkaline pH helps in the mating of X-Y chromosome. For those who wish to have a boy it is adviced that the female sits in a bath containing warm water in which sodium bicarbonate is added for at least 15 minutes before intercourse. However there is no certainity about its results.
Well, in all honesty its a 50-50 chance. if a sperm has the Y chromosone then its a boy. If it has an X then its a girl....but thats just genetics. in physicality the female sperm is faster than that of a male so the chances of having a male child are thus reduced....