#Sexratio

A groundbreaking new study published in Science Advances has upended the commonly held belief that the sex of a baby is purely a matter of chance, revealing that birth sex patterns within families may follow unique, weighted probabilities. This research—based on more than 146,000 pregnancies from over 58,000 women across nearly six decades—suggests that some families have a higher likelihood of producing multiple children of the same sex, offering fresh insight into age-old questions about why some parents end up with, for instance, “all girls” or “all boys” (Washington Post).