Hey mama, the sex of your potential offspring doesn’t fall far from the family tree. Researchers looking at hundreds of years of more than a thousand family trees in North America and Europe say the composition of your male partner’s family of origin holds clues to the sex of your future babies.
What they discovered is this—men seem to inherit a tendency to have more sons or daughters from their parents. So, a male partner with lots of brothers is more likely to have sons, and a man with a lot of sisters is more likely to father daughters.
Interestingly, the same trend is not true for women and their siblings. Newcastle University researchers suspect that an as-yet-undiscovered gene may affect whether your male partner’s sperm has more X or more Y chromosomes, which affects the sex of the children.
On a larger scale, the number of men with more X sperm compared to the number of men with more Y sperm affects the sex ratio of children born each year.
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