Repeated low fever in babies may occur as a result of chronic infections of viruses and bacteria, or diseases of the immune, hematologic and endocrine systems, and there is no such thing as a hint of the 3 major diseases. 1. Viral and bacterial chronic infections: caused by Mycobacterium tuberculosis, Coxsackie virus, Helicobacter pylori, etc., which can cause tuberculosis, pneumonia, gastritis, peptic ulcer, etc. in babies, leading to recurrent low fever. Treatment needs to be carried out according to the type of infection of the baby, including antiviral treatment and antibacterial treatment. 2. Diseases of immune, blood and endocrine system: such as immunodeficiency diseases, acute leukemia, tumors, etc., can also cause recurrent low fever in babies. There are many reasons for recurrent low fever, parents need to pay attention, and it is recommended to go to the hospital in time to find out the cause of the disease.