Baby forehead cool may be related to environmental factors, immature development of thermoregulatory function, fever and so on. 1. environmental factors: if the environment is cold, the baby’s head is not well warm, there may be forehead cool symptoms. 2. Thermoregulatory immaturity: the baby thermoregulatory immaturity, if the baby is more active and easy to sweat, after sweating there may be forehead cool phenomenon. 3. Fever: there may be caused by fever, in the early stages of fever, sympathetic excitation caused by peripheral vasoconstriction, resulting in forehead cool symptoms. The baby forehead cool may also have other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor’s treatment.