During the 1st trimester, a temperature higher than 103° F (39.5° C) increases risk of the following:

A miscarriage

Defects of the brain or spinal cord in the baby

Late in pregnancy, fever increases the risk of the following

Preterm labor

Doctors treat the cause of the fever, but women can also take acetaminophen to lower the temperature. Cooling blankets can be used in women with a very high fever.