A fever returning after 1 to 2 days in a child is often due to an ongoing infection that is not fully resolved yet. Give proper rest, plenty of fluids, light food, and continue monitoring temperature regularly to track the pattern. Avoid repeatedly giving medicines on your own and ensure doses are taken as advised. If the fever keeps coming back, lasts for more days, or is accompanied by symptoms like weakness or cough, consult a doctor to identify the cause and guide appropriate treatment.