Cleft lip and cleft palate, commonly known as “harelip” and “wolfsbane,” are caused by an obstruction in the development of the upper lip and palate during the embryonic period. The incidence of cleft lip and palate is about 1/800 to 1/1000, more in males than females. Cleft lip and palate can be unilateral or bilateral; complete or incomplete; complete cleft lip and palate are often accompanied by cleft alveolar ridge. The causes of abnormal embryonic development are also genetic in a few cases, but most of them are due to external causes, such as viral infections, drug intoxication, hypoxia, mechanical injuries, immune reactions, and environmental pollution. Cleft lip can damage the child’s appearance, and cleft palate can affect the child’s pronunciation. Children with cleft lip and palate have difficulty sucking, and some are prone to upper respiratory tract infections, so parents should pay special attention to their nutrition and care.