Baby arm joint ringing may be related to physiological factors, pathological factors. 1. Physiological factors: infants and young children joint development is immature, shallow joint nests, ligaments are loose, weak, joint gap is relatively large, so the range of motion is relatively large, the cartilage collision and friction between the joints, joints ringing. This is related to the physiological factors of infants and young children, is a common phenomenon. As the child grows and develops, joint ringing will gradually disappear. 2. Pathological factors: If the joint ringing sound appears near the baby’s shoulder blade, it is necessary to pay attention to the existence of “popping scapula”. This disease may be due to abnormalities in the shape of the medial angle of the scapula, friction with the surrounding tissues when moving, resulting in joint ringing. There may be other reasons for the baby’s arm joint ringing, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.