For four months baby fever 38 ℃, you can use the following measures to deal with: 1, to children to take a warm bath to cool down, because four months baby skin area is relatively large, to children for physical cooling effect is very good, to children after taking a warm bath can be through the physical direct effect of water, as well as the effect of evaporation of water, the child’s body excess temperature away part, 2, to children to apply oral rehydration salt, because children often cause body water loss, fever. Generally, after a warm bath, the child’s body temperature will be quickly reduced by about 2-3°C. 2. Apply oral rehydration salts to children, because when children have a fever, they often lose water in their bodies, and the amount of milk they eat will be affected to varying degrees when they have a fever. If a child’s fever is caused by the influenza virus, it is necessary to apply oseltamivir to fight the virus.