Fever, Age 3 and Younger - Topic Overview
Childhood immunizations can reduce the risk for
fever-related illnesses, such as
Haemophilus influenzae type b (Hib) infection.
Although no vaccine is 100% effective, most routine childhood immunizations are
effective for 85% to 95% of the children who receive them. For more
information, see the topic
Causes of fever
It is not unusual for a
preschool-aged child to have 7 to 10 viral infections in a year. Each new viral
infection may cause a fever. It may seem that a fever is ongoing, but if 48
hours pass between fevers, then the new fever is most likely from a new
Common causes of fever include:
Teething does not cause a fever. If a baby is teething and
has a fever, look for other symptoms that may need to be evaluated.
A fever that increases quickly may lead to a
fever seizure in some children. After a fever has
reached a high temperature, the risk of a seizure is less. Fever seizures can
be frightening to see, but they usually do not cause other problems, such as
intellectual disability, or learning problems. If your
child has a high fever and a seizure, see the topic
child's symptoms to decide if and when your child should see a doctor.