Whether an infant can drink formula when he or she has a fever depends on the overall condition of the infant and the cause of the fever. If the fever is caused by gastrointestinal symptoms, such as improper feeding and inflammation of the gastrointestinal tract leading to nausea and vomiting, it is not recommended to drink formula when the fever is caused by this cause, or the amount and concentration of formula feeding can be reduced, otherwise it will aggravate the gastrointestinal symptoms and is not conducive to recovery from the disease. If an infant has a fever that is not caused by gastrointestinal symptoms, but by respiratory illnesses such as colds and bronchitis, he or she can drink formula normally. During the illness, the infant’s gastrointestinal function is not very good, it is also important to pay attention to the overall concentration and amount of formula feeding to avoid aggravating the burden on the gastrointestinal tract.