The Mysterious Code of Having a Boy or a Girl Some families attach great importance to having a boy or a girl. They hope to have a son to carry on the family line or a daughter to accompany them in their old age. Giving birth to a boy or a girl has always been a hotly debated topic, but how do you give birth to a boy or a girl? Is there any secret code that can make your wish come true easily? Let’s elaborate on it from four aspects: genetic basis, dietary conditioning, lifestyle, and scientific methods. Genetic basis Chromosomes determine the sex of a fertilized egg. Humans usually have 23 pairs of chromosomes, one of which determines sex