Boy and girl sex dating video
It seems that the older a dad is the less likely the male sperm are to fertilise the egg and the female sperm win the race.
The latest evidence is that the quality of sperm does deteriorate with age and older men produce fewer male sperm.
It's the question everyone wants the answer to.
We've looked at the science about what influences the sex of a baby and used it for our gender predictor.
This may be linked to the fact that the more pregnancies you have, the higher your levels of the hormone gonadotrophin.Remember, whether you're having a boy or a girl, a healthy diet is very important before and during pregnancy.Some studies have looked at the father's occupation and the ratio of boys and girls.This may be linked to a higher chance of having a girl.A study divided 740 British women into groups according to their calorie intake.
Male sperm and embryos are acknowledged to be more fragile and it may be that they are more affected by mothers catching infections.