|The secret to whether a baby will be a boy or a girl is carried in the father's genes, according to a new study.
Research conducted by the University of Newcastle studied hundreds of years of family trees.
They found that men who had more brothers in their own family were more likely to have sons, while those with more sisters were prone to have girl babies.
The study, which examined 927 family trees, with details on 556,387 people from North America and Europe, going back to 1600, did not establish the same link between sibling sex and offspring sex for women.
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