Fever is the most common symptom of pediatric disease and the most common reason for doll visits. There are many causes of fever, but the most common causes in pediatrics are, in order: infection (bacteria, virus, mycoplasma, etc.) > connective tissue disease (Kawasaki disease, lupus erythematosus, rheumatic fever, rheumatoid arthritis, etc.) > malignancy (leukemia) > physical factor fever (heat stroke) > central temperature dysfunction. Fever is a double-edged sword, which is both beneficial and harmful to people. Benefit: The body’s immune function is significantly enhanced when fever is present, which is conducive to the removal of pathogens and the healing of diseases; fever is a sign of disease, which is equivalent to alerting mothers that their babies are sick; we also identify diseases based on the characteristics of fever. Harm: elevated body temperature will lead to lower enzyme activity in the body, slowing down many physiological activities in the body, doll spirit, diet decline, the function of the systems may be disordered; high temperature is also likely to cause convulsions, impaired consciousness, and even serious sequelae. The body temperature is relatively stable under normal circumstances, fever, there must be a reason for the cause of the doctor to identify the cause is still difficult, the family should not make their own guess, once the fever, you must go to a professional pediatrician to clarify the cause and then symptomatic treatment. However, there is no need to panic when a baby has a fever, and it is important not to rush to the doctor and use drugs indiscriminately. A low to moderate fever (37.5-38.9°C) does not require the immediate use of antipyretics and can be physically cooled. Don’t use antibiotics until the cause is clear, either. The best way to reduce fever in dolls is physical cooling, with clear results and without any side effects. As the saying goes, all antipyretic drugs have side effects, unless the fever is moderate or above, the use of antipyretic drugs is generally not recommended. Physical cooling refers to the use of physical methods of cooling, summarizing several better with advantages and disadvantages, mothers can choose randomly according to the actual situation: warm bath: the doll will be stripped naked, warm bath in a warm bathroom without wind, the water temperature at about 38 ℃ best. Advantages: simple and easy, good cooling effect; disadvantages: only feasible at home, not convenient in the hospital or outpatient clinic visits. Ice bag cooling: ice bag (available frozen mineral water, ice-cream, sorbet, stick ice and other kinds of low-temperature things) across the towel on the forehead, bilateral neck, armpits, groin, pay attention to the compress a dozen seconds loose a dozen seconds, do not dress on regardless of frostbite baby. Advantages: the effect is clear, simple and easy to do, can be done anywhere. Disadvantages: careless family members may frostbite baby. Cooling patch: expose the forehead, bilateral neck, armpits, groin, and paste cooling patch. Advantages: simple and easy to use, can be used anytime and anywhere. Disadvantages: slightly less effective, poor compliance of the baby always want to pull. Alcohol bath: dilute alcohol or white wine to water and then rub. Advantages: the effect is exact, simple and easy to use. Disadvantages: cooling too fast, alcohol can be absorbed from the skin leading to drunkenness, alcohol allergy, or in the case of simultaneous use of drugs such as cephalosporins or metronidazole, leading to a disulfiram reaction aggravating the condition. Hot Rolling Dan: A physical cooling device, which is applied to the skin with gel, alcohol, etc. to take away the body temperature by its evaporation. Advantages: clear effect, convenient, simple and easy to use. Disadvantages: same as alcohol. Although there are side effects of drugs to reduce fever, but medium to high fever harm may be greater, so should be actively cooling, physical cooling and drug fever at the same time. The World Health Organization (WHO) and Uncle Chen recommend only two drugs for fever reduction in pediatrics: ibuprofen and acetaminophen. All babies with fever and those who use antipyretic drugs to reduce fever must be supplemented with water (preferably salt water), firstly because antipyretic drugs need the aid of water to be fully effective, and secondly because the use of antipyretic drugs will lead to increased sweating and water loss, and failure to supplement water in time will easily lead to water and electrolyte disorders and aggravate the disease. The doctor’s advice: drink more water, not just for fun, mothers need to follow medical advice without compromise. Fever itself is not a disease, it is just one of the manifestations of the disease. The most important part of the treatment is to find out the cause of the disease, the nature of the disease, and then comprehensive treatment.