Baby chest high may be certain physiological phenomenon, may also be the manifestation of certain diseases such as rickets, etc., should be timely consultation to identify the cause. 1. Physiological factors: it may be due to the baby’s chest is more round, it will look more prominent. Generally as long as the baby’s lower edge of the rib cage does not appear typical bead-like bulge, usually a normal phenomenon. 2. Rickets: rickets can cause chicken chest, chicken chest is a common chest wall deformity in childhood, often manifested as the sternum protrudes forward and the adjacent rib cartilage and ribs are concave. This means that the bones have abnormalities in the metabolism of calcium and phosphorus, resulting in poor bone growth. However, this symptom alone is not enough to diagnose the disease, and other factors may be involved. Parents are advised to take their babies to the doctor for diagnosis and treatment if physiological causes are ruled out.