Infants’ head shaking from side to side while sleeping may be related to physiological factors, or may be caused by eczema, calcium deficiency and other factors. 1. Physiological factors, due to the fact that infants are relatively small, the body is not yet fully developed, the basal metabolic rate is elevated, this symptom may occur. 2. Eczema, some infants with eczema may develop this symptom due to irritation of the skin tissue. 3. Calcium deficiency, if the infant’s body lacks calcium, it may lead to increased nerve excitability and abnormal function, so it is more likely to appear head shaking symptoms, accompanied by sweating and other reactions. Babies sleep head shaking, there may also be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to determine the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.