Three-month-old baby’s head is always tilted on one side, may belong to the abnormal manifestation, may be related to the factor of cervical tilt, can improve the ultrasound examination to assist in the diagnosis. Cervical tilt is a disease caused by spasm of one side of the neck muscles, and accompanied by different degrees of neck movement restriction. This disease is mainly characterized by congenital cervical strabismus, which is considered to be related to the ischemic spasm caused by the compression of the neck muscles of newborn babies due to obstructed labor during delivery. If a three-month-old baby’s head is always tilted to one side, it may be abnormal, and he needs to go to the hospital as soon as possible, improve the ultrasound examination to make a clear diagnosis, and then he can be treated by conservative treatment or elective surgery, so as to improve the deformity caused by muscle spasm. This will improve the appearance of the child as well as the quality of life.