Each parent contributes half of a baby's genetic make up. The female or mother is genetically an XX, so she is only able to contribute an X to the future baby. The father of the baby is XY and can contribute either an X or a Y. This means that sperm is the deciding factor in how your baby's sex is determined.
haha ive read way to many books lol,
another facter to think about is this - boy sperm r fast but only lasts inside a woman 2/3 days
- were as girl sperms are much slower but can last 5/7 days
they say people who have had sex loads an every day are more likely to have a boy due to the fact as when the woman ovulates the males sperm would be first there as hes the fastest,
were if you were to have sex once a week or every 4 days you are more likely to have a girl coz the males sperm would of rushed of being speedy n have nothing to greet them at the other end n the dye off, leaving the girl sperm who just plodds alone free to fertailise
now this is only ruff coz you could be one of them lucky people who only have sex twice a week but happen to have it bang in ovulation which would mean you prob would have a boy but i find if really interesting
hehehe x x x