Can parents decide the sex of their unborn child? New research challenges 50-50 myth, biological sex of children may not always be random

A new study challenges the understanding of sex determination. It suggests families might have a bias toward having children of the same sex. The research, led by Dr. Jorge Chavarro, analyzed data from the Nurses’ Health Study. Some couples were more likely to have all boys or all girls. Maternal age and genetics may play a role.