Introduction Pregnancy is an important stage in a woman\’s life, but many expectant mothers are very curious about whether their baby will be a boy or a girl. Although modern medicine can already predict the gender of a fetus through B-ultrasound, in an era when medical technology was underdeveloped, people used to explore various mysterious signs of a boy or a girl. So, what are the symptoms of pregnancy and giving birth to a boy or a girl? This article will introduce relevant knowledge from four aspects. Appearance characteristics can be seen from the external characteristics