In general, when a baby has a fever, the body temperature of the whole body is not balanced, the neck is hot is a normal phenomenon, mainly caused by the following two reasons: 1, the neck is richer in blood flow, the fat layer is thicker, the temperature will be slightly higher. 2, the neck is not covered by clothing, heat dissipation is easier, the phenomenon of a hot neck will occur. 3, the development of the thermoregulatory center is not perfect, the local body temperature 4, local infectious lesions can cause serious local fever, this time you can observe the skin around the baby’s neck, whether there is obvious redness, swelling, tenderness and other symptoms of acute traumatic inflammation, to determine whether it is caused by local infectious lesions. If this is the case for a long time, it may hurt the baby’s central nervous system and thus affect its intelligence, if necessary, we should use physical fever reduction method to cool down the neck.