Bone ringing in infants is generally a normal physiological phenomenon, caused by the developmental characteristics of infants, and is not a cause for concern and generally does not require special treatment. In a few cases, the cause may be pathological, and timely treatment can often lead to a better prognosis and will not affect the subsequent growth and development of the infant. Since infants are growing and developing, the ligaments are relatively weak, and the joint fossa is shallow, and the bones of infants are soft, with cartilage at the end of the long bones, when the joints do flexion and extension movements, there may be a popping sound, such as when picking up the baby or changing the position of the baby, which is a normal physiological phenomenon in the process of growth and development. This is a normal physiological phenomenon in the process of growth and development. Although there is a rattling sound of bones, there is no pain and the movement of the baby’s limbs is not affected. Parents do not need to give special treatment, as the baby’s body continues to develop, this joint popping sound will gradually become less and less until it disappears. The more common cause is hip dysplasia, which is occasionally caused by fractures that occur during normal birth. 1. Hip dysplasia: If the baby makes a rattling sound when the joints move, especially the hip joint. When changing diapers, the infant has one thigh that is not easily pulled apart and the skin folds behind the thigh are asymmetrical. In this case, it should be noted that the infant may have hip dysplasia, and the infant needs to be brought to the hospital promptly. It is recommended that infants under 6 months of age do an ultrasound examination of the hip joint, and infants over 6 months of age check the X-ray examination of the hip joint to make a clear diagnosis, so that timely targeted treatment can be given; 2. Shunnatal fracture: If a fracture occurs in the clavicle area of the infant during shunnatal delivery, there can be a strange sound when the bone moves, which generally does not require treatment and can gradually heal. If the misalignment is more serious and involves nerve and blood vessel damage, surgery should be taken in time.