The fever is usually caused by inflammation or viral infection, it is best to perform routine blood tests and take anti-inflammatory or anti-viral drugs under the guidance of a doctor to help control the infection. In addition, it is recommended to exercise properly, during the period of taking drugs, it is best to stop breastfeeding, it is recommended to drink more water to speed up the excretion of drugs. It is recommended to eat more vegetables and fruits, and take vitamin C to enhance resistance and prevent colds, etc. It is better not to overwork during breastfeeding and not to eat spicy and stimulating food.