Study Shows Gender Determination at Birth Not a Coin Flip

A recent study by Harvard University suggests that a newborn’s sex is not as random as a coin flip, with family genetics and maternal age playing significant roles. Analyzing data from over 58,000 US nurses, researchers found that the odds of having a boy or girl within families are not always 50-50. For instance, parents with three daughters had a 58% chance of having a fourth girl, while those with three sons had a 61% chance of having another boy. Maternal age also showed a modest influence, with women over 28 more likely to have children of the same sex. While two genes were identified as linked to single-sex children, further confirmation is needed. Experts emphasize the need for additional research to fully understand the biological basis of these patterns. (Newser)