8 months baby sleep head always sweat a lot, may be the room temperature is too high, keep warm too thick and other physiological factors, may also be and lack of vitamin D, fever and other pathological factors related. 1. room temperature is too high, wear too thick: 8 months baby sleep if the room temperature is too high, or parents to the baby wear too much clothing, etc., will lead to the baby sweating. 2. Lack of vitamin D: when the baby is about 8 months old, if the baby lacks vitamin D, when sleeping, there will be a lot of sweating, and there may also be easy to startle, occipital baldness and so on. 3. Fever: fever is mainly caused by abnormalities in the central thermoregulatory system, and in the case of fever, if the body temperature is in the stage of decline, it will also lead to a lot of sweat on the baby’s head. Physiological factors caused by the baby sleep sweating, do not need to be treated by drugs, but parents should adjust the room temperature and adjust the baby’s clothing. Pathological factors caused by the baby sleep sweating, need to go to the hospital as soon as possible, accept the doctor’s targeted treatment, parents can not blind treatment, so as to avoid the wrong medicine.