Baby joints ringing, can be caused by physiological reasons or hip dislocation, knee meniscus development abnormalities and other reasons. 1. Physiological reasons: due to the baby joint ligaments are relatively loose, and the articular cartilage is thicker, when the baby activities, joint movement so that the articular cartilage friction rattles, this is a normal physiological phenomenon, as the baby grows older will gradually disappear. 2. Hip dislocation: mostly caused by hip dysplasia. In the baby’s activities, the hip joint will be dislocated and reset, with mutual friction impact, there will be a joint ringing sound, this time more accompanied by pain, the baby will often cry more than. 3. Abnormal development of knee meniscus: Meniscus can play the role of lubrication, reduce the role of shock. If the meniscus development is abnormal, it will lead to abnormalities in the baby’s knee joint during activities, also known as knee popping, it is recommended to take the baby to the hospital to improve the MRI and other imaging tests. It can be seen that if the baby’s joints are ringing, it is recommended to go to a regular hospital to exclude the joints ringing caused by pathological factors.