Baby face side face big side face small may be due to bad sleeping posture, this time need to pay attention to correct the sleeping posture; may also be due to congenital muscular strabismus and other diseases, can be corrected through local hot compresses, massage, manipulation correction or surgical treatment. 1. Bad sleeping position: one side of the baby’s face is big and one side of the baby’s face is small is mainly caused by bad sleeping position after birth, especially one side of the sleeping time is too long, it is recommended to correct in time, try to sleep on both sides of the replacement, more can be corrected. 2. Congenital myoclonic cervix: it refers to the fibrous contracture of the sternocleidomastoid muscle on one side, resulting in deformity of the neck and head and face to the side of the disease, which is one of the common musculoskeletal congenital diseases in newborns and infants. It can be corrected by localized hot compresses, massage, manipulative correction and external fixation of orthopedic caps in infants less than 1 year old, and can be treated surgically in infants older than 1 year old, with the optimal age for surgery being 1 year old. There are many other factors that can cause a baby to have a large face on one side and a small face on the other. When such a condition is detected, it is recommended that the baby be seen by a specialist in a timely manner.