Hip subluxation is medically called hip dysplasia and is commonly seen in infants and young children. The hip joint is a ball and socket joint, and a variety of reasons can affect the development of the hip joint in infants. The main causes of hip subluxation in infants and children include the fact that the ball-shaped femoral head is not well seated in the ball and socket, thus causing the hip joint to mismatch and sometimes the femoral head to prolapse from within the acetabulum during hip movement. In addition, the acetabulum is too shallow and thus does not wrap around the femoral head enough, which can also cause the femoral head to prolapse or slip out. The main manifestation of this disease is the early detection of a popping sound from the hip joint, and as the baby’s activity increases, hip pain and even walking limp may occur. The earlier the treatment, the better, because most babies can develop normally through orthopedic treatment in infancy and early childhood. By fixing the hip joint in the correct position through splints or braces and fixing it in the abducted position for a period of time, most hips can develop normally. If orthopedic surgery is not found until after adulthood, try to choose hip preservation surgery, such as deepening the acetabulum or increasing the hip wrap, and improving the symptoms of the hip joint through osteotomy.