A child’s repeated fever and cough may be caused by low immunity. It is recommended to undergo an immune function test to determine if there is a lack of immunoglobulin in the body, and consider intravenous immunoglobulin therapy if necessary. Before taking medication, it is important to check routine blood test to ensure there is no bacterial infection. Avoid the misuse of antibiotics as it may weaken the child’s resistance. Additionally, try to keep your child away from patients with respiratory infections to prevent cross-infection.