The hip frog hold method is mainly used for babies with hip dysplasia at a young age, to understand the role of the hip frog hold method we need to understand hip dysplasia. When a small-month-old baby is found to have bilateral asymmetry in the skin pattern of the hip and leg or the angle of abduction of the two thighs is not in place, or even the bilateral lower limbs are not equal in length, the doctor will send the baby for a B-type ultrasound of the hip joint. If it is found that the baby’s B-mode ultrasound report is incorrect in the angle between the alpha and beta angles, which means that the angle between the femoral head and the acetabulum development is in error, the femoral head will not be able to enter the correct position within the acetabulum accurately in the future, which may lead to hip instability, dislocation or subluxation. The doctor will instruct the baby to be held in froggy position, the purpose of which is to keep the thigh bone and pelvis at the correct and stable docking angle, which is conducive to the development of the femoral head and the correct docking of the femoral head with the acetabulum, thus maintaining the normal development of the hip joint and the normal function of the hip joint.