A few children's chicken breasts are congenital, and the acquired chicken breasts are mostly caused by rickets. Children's bones in infancy are made of cartilage. If the supply of vitamin D and calcium is neglected at this time, it will hinder the absorption of calcium and phosphorus, cause osteomalacia, make the joint of chest ribs and sternum invaginate, make the sternum protrude, and form a chicken breast. In addition to chicken breasts, children are often accompanied by other deformities, such as square skulls, "X"-shaped legs and "O"-shaped legs.

In chicken breast patients, the chest ribs protrude forward, which increases the anterior and posterior diameter of the chest and reduces the volume of the chest cavity, which limits the development of the lungs; The elasticity of lung tissue decreases, which leads to weakened breathing range, poor exercise tolerance and low resistance. Some patients have shortness of breath, fatigue, bronchitis or pneumonia, and even seriously affect cardiopulmonary function.