Five months baby head to one side, may be physiological or pathological factors, physiological factors such as long-term fixed one side lying position; pathological factors such as tilt neck can lead to the baby’s head to one side crooked. 1. Physiological factors: when the baby is lying down, keeping a long-term fixed one-side lying position will cause the baby’s head to be habitually tilted to one side. Generally, after correcting the habitual posture of head tilting, it can be relieved. 2. Pathological factors: in addition to the habitual bad posture, may also be caused by cervical tilt, with cervical tilt, the baby’s head will be tilted with the neck, the symptoms of tilted to one side. According to the etiology, strabismus can be categorized into muscular strabismus and bony strabismus. Five-month-old babies head tilted to one side, there may also be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.