Since records began in , the cries of babies born every year have been predominately male. Below are relevant articles that may interest you. In a study published in the journal Evolutionary Biology , the researcher, Corry Gellatly, examined the histories of more than American and European families dating to , involving more than half a million people. Together, these results suggest that girls need a bigger genetic hit than boys to have autism. It has long been suspected that men who come from families with plenty of males have higher odds of fathering boys, and that for men with many sisters, it is vice versa. David grew up with five sisters and one brother so he was very comfortable being a father of daughters. You might also like You might also like Was your ultrasound accurate in predicting a boy or girl?
It could be, at least in part, due to genetics. Reuse this content. Politics N. Parents may swear by these techniques, but scientists say there is little evidence they make any difference. Studies reveal that in the US white fathers produce about sons per daughters, African American and American Indian fathers produce about , while older fathers produce more daughters. Researchers have found a 3-to-1 ratio even when they have followed children from infancy and repeatedly screened them for autism, minimizing the possibility for biases in diagnosis and referral.
