Introduction to the context of giving birth to a boy or a girl. Giving birth to a boy or a girl has always been a topic that has attracted much attention. From ancient times to the present, people hope to successfully get a baby of the gender they want. However, the reasons for having boys and girls are not very clear and need to be analyzed from many aspects. Genetic factors First of all, there is a certain relationship between having a boy and a girl and genetic factors. Boys are made from male sperm