The best time for head shape correction is within 4 months of age. This is because at this age, the cranial suture and skull are still developing and can be corrected with a high degree of plasticity. After 4 months of age, if not corrected, a professional cranial orthosis is given. This orthosis needs to be professionally customized in the hospital and worn for a longer period of time, almost 24 hours a day. The cause of cranial deformity is caused by prematurity, long time lying on the side in the incubator after birth, the common cranial deformities are flat head deformity, oblique head deformity and long head deformity.