A child’s fever once a week is usually caused by a weakened immune system. Children with low immunity also have a reduced ability to resist external viruses or bacteria, and are easily attacked by external pathogenic bacteria, which produce a large number of toxins and stimulate the body’s thermoregulatory center, resulting in fever. Common causes of fever in children include upper respiratory tract infections, tonsillitis, pneumonia, etc. These diseases can lead to frequent fever in children due to the stimulation of pathogenic bacteria infection or inflammation. It is recommended to go to the hospital in time for examination to identify the specific cause of fever and then treat the symptoms. It is recommended to take the child to the hospital for relevant examinations, usually need to ensure that the child’s nutrition is balanced, appropriate increase in physical exercise, eat more protein-rich food, such as eggs, milk, etc.. If there is a lack of nutrients, it is recommended to supplement the relevant nutrients under the guidance of the doctor.