The main reason for the formation of hernia in children is embryonic developmental factors: The main reason for the formation of hernia in children is embryonic developmental factors. In the early embryonic stage, the testes are located in the retroperitoneum, and then gradually descend and move down the inguinal canal to form the scrotum by pushing the abdominal wall tissues. During this process, the peritoneal tissue on the surface of the testis forms a sheath-like protrusion, which closes on its own soon after birth, but if the sheath is not atretic or incompletely atretic, the sheath still communicates with the abdominal cavity, forming the hernia sac of congenital hiatal hernia. The manifestation is that the intestinal canal or greater omentum often prolapses into the hernia sac, and a hernia bag leading to the scrotum appears in the inguinal region. The right testicle descends slightly later than the left and the sphincter atresizes later, so inguinal hernias are more common on the right side than on the left.