Newborns do not need to tie their hands and feet, especially to help the baby’s legs and feet, will affect the development of the baby’s hip joint, and serious hip dislocation will occur resulting in a limp when the baby walks. When the baby is born, the hip joint is flexed. When the baby’s legs are in the abducted and flexed position, the femoral head will be more firmly embedded in the acetabular fossa, and the hip joint is in the flexed position, which will make the hip capsule stronger and more powerful, and with the growth of the baby’s age and the development of large movements, the hip joint will slowly become straight. If the baby is because of the reason of jumping reflex, parents can swaddle the baby, that is, use the package quilt to wrap the baby’s upper body and arms, but not restrain the lower limbs, legs and feet free, this can prevent the occurrence of frequent reflexes, but also conducive to the normal growth and development of the baby.