1. What is baby fever? Baby fever refers to a condition in which the body temperature of infants and young children rises above the normal body temperature. The normal body temperature range is between 36.5°C and 37.5°C. If the baby\’s body temperature exceeds 37.5°C, it is considered to have a fever. 2. What are the causes of fever in babies? 1. Infection: Colds, coughs, pneumonia, etc. may cause fever in babies. 2. Teeth growth: When teeth grow, it will cause oral discomfort and cause the baby to have fever. 3. Immunization: Low fever or moderate fever may occur after vaccination.