Baby fever during weaning, may be related to the body immunity decline, dietary changes and other factors. 1. Decline in body immunity: the baby’s own immunity is low, and after weaning, he/she is still unable to obtain immune substances from the mother’s source, the immunity will decline again on the original basis, and the chances of infections are greatly increased, and fever may occur after infection. You can follow the doctor’s instructions to wipe, give fever reducer, acetaminophen, ibuprofen and other drugs to reduce fever treatment. 2. Dietary changes: Babies have been breastfed or formula-fed since birth, and suddenly weaning babies from milk will make them unaccustomed to their diets, and fevers may also occur. For this situation, it is recommended that weaning should be gradual. Fever during weaning needs to be taken seriously by parents, and it is recommended that they go to the hospital in time for examination to clarify the cause of the illness and then follow the doctor’s instructions for treatment.