A fever in a child for 2 to 3 days is often due to a common infection, and giving antibiotics without proper advice may not always be needed. Make sure your son stays well hydrated with water or other oral fluids, give him light, easy-to-digest food so his body can recover, and keep him comfortable with rest and light clothing. You can sponge him with normal water if the fever is high and check his temperature regularly to track improvement. Avoid giving any more doses without guidance, as the treatment depends on the exact cause. If the fever continues, increases, or he becomes less active or irritable, it needs attention. Consult a doctor to assess him and guide appropriate treatment.