Call the doctor immediately if any of the below mentioned conditions persists:
Under 3 months: It is highly recommended to call a doctor if your children below 3 months is having fever of 100.4 F (38 C) or higher.
3 to 6 months: A fever of 101°F or higher.
Over 6 months: A fever 103°F or higher.
Also consider one or more symptoms for children and adults:
Pregnant women who are having fever of over 101°F (38°C) should be consulted immediately with the doctors. Since fever causes the above mentioned symptoms, it will affect the baby as well.