There are several reasons for children to have low fever all the time, generally the following: a. Consider the symptoms of low fever all the time because the infection lesion in the child’s body is not effectively controlled. It is recommended that parents take their children to the hospital for routine blood tests, and according to the test results, give symptomatic antibacterial or antiviral treatment to improve the symptoms of low fever all the time. Second, consider that the diet is not regular, often eating high-protein, high-fat food, or overeating, resulting in indigestion and symptoms of food accumulation, causing the baby to have low fever and decreased appetite. Third, if the child has been suffering from low fever along with symptoms such as cough, lethargy and night sweats, consider having tuberculosis. Parents are advised to take the child to the hospital immediately for relevant examinations, such as tuberculin test, chest X-ray, sputum culture, etc. Based on the test results, give symptomatic anti-tuberculosis medication to improve the symptoms of low fever all the time.