1, infants and children in the process of growth and development of the thorax may be due to incorrect posture, rickets, vitamin D deficiency, severe malnutrition and other reasons appear thoracic deformity. Generally speaking, after correcting the causes and strengthening the exercise of the chest, the shape of the chest will gradually return to normal as the child grows and develops. 2, heart surgery will cause a certain degree of damage to the sternum, and it takes about 2 months for the sternum to heal completely. During this period, it is necessary to pay more attention to the supplementation of vitamins and various microelements, and infants and children should have proper exercise and sunshine. Some children may find that the lower part of the sternum is bulging forward about 2~3 months after surgery, which is similar to “chicken breast” in serious cases. The main reasons for this condition include: malnutrition, lack of vitamins and calcium, incorrect daily posture and body position, lack of proper sports and exercise, and poor development of the sternum and rib cartilage. 4.For the majority of children with this condition, the main thing is to supplement sufficient amount of vitamins (normal diet, fruits, fresh vegetables), ensure proper exercise and sunshine, which will generally ease or disappear in 3~6 months after surgery, and no special treatment is needed. In addition to the above treatment principles, a few children with severe anterior convexity of the lower part of the sternum, which is obviously similar to “chicken chest”, should use a thoracic splint for thoracic orthodontic treatment under the guidance of a doctor from about 6 months after surgery, and can generally recover their normal appearance after at least 3-6 months of orthodontic treatment; if the treatment is too late, the deformity may Some deformities may remain.