The left side of the baby’s face is bigger than the right side of the baby’s face in more than six months, which may be caused by sleeping towards the left side for a long time, but also need to be alert to congenital slanting neck and other deformities. 1. Long-term sleep on one side: a long time to maintain a position, easy to cause facial edema, you can adjust the baby’s sleep position, generally change the position can be relieved. 2. Congenital strabismus: the left side of the face is bigger than the right side of the face, it may be a slight right-sided strabismus, which needs to be clearly diagnosed through manual palpation and ultrasound examination, and if it is determined to be a right-sided strabismus, it can be treated by massaging within 1 year of age, and it may need to be operated to loosen the sternocleidomastoid muscle above 1 year of age. If the left side of the baby’s face is bigger than the right side, it is necessary to be alert to the possibility of congenital cervical strabismus. It is recommended to take the baby to pediatric orthopedics and pediatric insurance department for examination to determine the cause of the disease and symptoms, and to take a reasonable way of treatment.