Known causes of fever in children include viral infections, overdressing and immunizations, according to KidsHealth. A fever is a symptom of an underlying condition, not an illness itself.
Infections and illnesses cause most fevers in children. A fever stimulates natural defense mechanisms in the body that fight infections, as stated by KidsHealth.
Overdressing an infant can sometimes cause fever because infants are unable to regulate their body temperature as effectively as older children and adults, explains KidsHealth. However, all infants with fevers require a medical examination to rule out an infection.
Childhood vaccinations can sometime cause a low-grade fever, according to KidsHealth.