Some can kill the fetus. Some are passed to the child during birth. Some can cause birth defects, retardation, blindness, and other health problems for infants and children. Be sure to talk with your clinician any time you think have been exposed or have symptoms. Symptoms include abdominal discharge, growths, blisters, pain, and unusual odors.
Most treatments have no risk for the fetus.
It is always better to use a male or female condom during pregnancy to protect against infection.