Congenital chicken breast is as genetic as funnel chest deformity, and the incidence of chicken breast is obviously increased if there is chest wall malformation in the family. During the fetal or infant period, the development imbalance of sternum, spine and ribs caused thoracic deformity. The secondary reason is the hypoplasia of the central tendon attached to the sternum by the diaphragm. For example, the hypoplasia of the front part of the diaphragm is attached to the back of the rectus abdominis sheath instead of the xiphoid process and rib arch, which will make the lower part of the sternum move forward without the support of the diaphragm, leading to the formation of chicken breast deformity.

2. Acquired factors

(1) Malnutrition Infants and young children can't get enough nutrition after birth, and suffer from some malnourished diseases, such as rickets in children, which may affect the development of sternum and so on for a long time, resulting in thoracic deformity.

(2) Diseases secondary to chest cavity, such as some congenital heart diseases, the enlarged heart compresses the chest wall, resulting in chicken breast deformity. Flat chest deformity caused by chronic empyema. Long-term chronic respiratory infection can weaken respiratory function. In order to meet respiratory needs, diaphragm movement is strengthened, and Hausdorff's groove is depressed, gradually forming chicken breast deformity. There are also patients who are secondary to heart or chest surgery.

In view of the above symptoms, it is suggested that mothers should give their children more calcium supplements and exercise more. Feel helpful, please adopt it.