When the baby has a fever, it is recommended to give priority to breastmilk or formula milk, and supplemental food can be chosen as light and easy to digest fluid or semi-fluid food, fruits and vegetables, etc. At the same time, attention should be paid to replenish sufficient amount of water, and to avoid adding new supplemental food. When the baby has a fever, most of them will have a decreased appetite and weakened gastrointestinal function. At this time, it is recommended that the baby’s diet structure is simpler, and breastfeeding and formula feeding are recommended first. If the baby is older, simple breast milk can not satisfy the baby, you can add a moderate amount of light and easy to digest liquid food or semi-liquid complementary food, it is best to add the complementary food that has been added before, to avoid adding new complementary food. When the baby has a fever, the loss of water in the body is more, it is recommended to give the baby more milk to replenish water. In addition, when the baby has a fever, parents are advised to consult a doctor in a timely manner and follow the doctor’s instructions for targeted treatment.