The baby’s leg creaking may be physiological factors, may also be the manifestation of certain diseases, such as hip dysplasia and other causes. 1. Physiological factors: it may be because the baby’s own bones are relatively fragile, the ligaments around the joints are relatively loose, there will be a baby’s legs creak when you move, this abnormal sound is common in the knee and hip joints. This is a normal physiological phenomenon, do not worry too much, generally do not need special treatment. 2. Hip dysplasia: If the baby makes a rattling sound when the joints move, especially the hip joints. When changing diapers, one side of the baby’s thigh is not easy to pull apart, and the skin folds on the back of the thigh are not symmetrical, this situation should be noted that the baby may have hip dysplasia, and you need to bring the baby to the hospital in a timely manner. This symptom alone is not enough to diagnose the disease, and may be caused by other factors. It is recommended that the patient consult a doctor in time to clarify the cause of the disease and give targeted treatment.