In infants 3 months of age or younger, an increase in body temperature of even a couple of degrees can be a sign of a potentially serious infection and should be taken very seriously. 

Causes of fever

Infection. Most fevers are caused by infection or other illness. Researchers believe fever helps the body fight infections by stimulating natural defense mechanisms.

Overdressing. An infant’s brain has not developed fully enough to regulate his body temperature. Babies may develop fevers if they’re too bundled up or are in a hot environment. 

Immunizations. Babies and children sometimes get low-grade fevers after getting vaccinated.

Teething. Although teething (starting at approximately 4 months of age) sometimes leads to a slight rise in body temperature, it’s probably not the cause if an infant’s temperature is higher than 100F. Call your doctor to be sure.


Join Our Newsletter Back to Top