Infants and young children sleep head shaking left and right may be physiological factors, calcium deficiency, eczema and other factors. 1. Physiological factors: when the body temperature is higher during sleep, the infant’s head sweats more, due to the sweat on the back of the head area caused by the stimulation, so that the back of the head area is uncomfortable, it will shake the head frequently. 2. Calcium deficiency: when infants lack calcium in their bodies, it may lead to low blood calcium levels, which will cause infants to shake their heads frequently at night, and there may also be occipital baldness and crying, which will seriously affect their physical development. 3. Eczema: may be related to environmental factors, can make the back of the head part of the red pimples, accompanied by itching symptoms, infants will be shaking their heads to relieve the itching, may also be accompanied by more than crying. Infants and young children sleep head shaking from side to side, and there are other abnormal manifestations, seriously affecting the quality of sleep, it is recommended to take the child to the doctor for examination and treatment.