Your child has a fever if: Ear or Forehead temperature: 100.4° F (38.0° C) or higher. Oral or Mouth temperature: 100° F (37.8° C) or higher.

Fever is a body temperature of 100.4 F (38 C) or higher. Fever is a symptom, not a disease.

Questions about how to take the temperature and when is it a fever.

Fifth disease is a viral rash that starts with red cheeks. Then it spreads to the shoulders and upper thighs.