Fever itself is not a disease, it is only a symptom or sign of some diseases, in the case of babies, the most common are respiratory tract infections, gastrointestinal tract infections, or urinary tract infections caused by fever. In fact, fever is a positive behavior of the baby’s body to fight infection, can stimulate the baby’s body of certain defense mechanisms, similar to the body to pull the alarm, promoting the release of white blood cells lysozyme, interleukin and other immunologically active factors to promote phagocytosis of macrophage activity, to attack and kill pathogens invading the baby. From this perspective, fever plays an important role in the baby’s own fight against infection, and fever is still beneficial to the baby. However, fever also has a negative side, for example, fever can cause discomfort in babies, can affect the digestive function of the child resulting in poor appetite, can cause the baby’s heart rate and respiration to increase, but also increase the baby’s need for fluids. Therefore, fever is not necessarily harmful to babies, and sometimes it is even beneficial. Parents should not be overly nervous when their babies have a fever, because many of the illnesses that cause fever in babies are benign, and most of them are self-limiting. What parents need to do is to know the home remedies for fever, apply fever-reducing medicines wisely, give more water to the baby, and take the baby to the doctor in time when they can’t handle it by themselves.