Most people think of 104 F as a "high fever. " When a child spikes a temperature elevation around 103F or 104F, the fever may respond to antipyretics (Tylenol, Motrin). A low-grade fever (100. 5, 101F, etc. ) is usually more worrisome than a spiky fever of a high temperature. Once the temp exceeds 104F, and is not responding, contact your physician.