What is the difference between conceiving a boy and a girl: explaining the causes of fetal gender from a scientific perspective. Being pregnant is something every woman wants to experience, and during pregnancy, many women want to know whether they are carrying a boy or a girl in their body. It is very important for pregnant women, because the gender of the fetus also means the future fate of the child. Therefore, the issue of gender distinction during pregnancy has always attracted much attention. The author will explain the causes of fetal gender formation from a scientific perspective. 1. Gender-determining genes Expectant parents have a 50% chance of giving birth to a boy or girl every time they become pregnant. This is because of gender