9 months baby shaking head may be the environmental temperature is too high, frightened and other physiological factors, or may be rickets, pediatric eczema and other diseases. 1. Physiological factors: Because the 9-month-old baby language system is not yet perfect, when the environmental temperature is too high, frightened, may appear shaking head. If not accompanied by other symptoms of discomfort, are normal phenomena, parents do not need to worry. 2. Rickets: Rickets is mainly caused by various reasons leading to vitamin D deficiency in the body, calcium and phosphorus metabolism malfunction, resulting in bone lesions. Children can appear irritable, sweaty scalp stimulation and head shaking, crying at night, sleep disturbance and other symptoms. 3. Pediatric eczema: Pediatric eczema may be caused by heredity, impaired skin barrier function, food allergy, environmental stimulation and other factors. Affected children will have localized skin erythema, papules, blisters, itching and other symptoms. If eczema appears on the head and face, due to the itching symptoms, the child may be irritable and constantly shaking his head. Nine-month-old baby shaking his head, there may be other causes, it is recommended to go to the hospital, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.