Developmental hip dysplasia is a common congenital hip deformity in clinical practice. It mainly refers to the loss of the normal relationship between the femoral head in the joint capsule and the acetabulum, which does not develop normally after birth, manifesting as impaired movement of the joint and significant shortening of the affected limb. The skin folds on the inner thigh and hip of the affected limb are asymmetrical, deep and increased in number, and this change can usually be detected on the outside. If such changes are detected, it is important to go to the hospital promptly to find out if the child has any hip deformity. Usually an ultrasound of the hip joint and, if necessary, a frontal and lateral radiograph of the hip joint should be done to clarify the presence of hip dysplasia. If detected in time, early conservative treatment can be carried out, and if necessary, surgical treatment.