Final answer:
STIs in pregnant women can have serious consequences for the unborn fetus, leading to complications in fetal development and possible infant death.
Step-by-step explanation:
Sexually transmitted infections (STIs) in pregnant women can have serious consequences for the unborn fetus. Infections can be transmitted to the fetus through the placenta, leading to complications in fetal development. Depending on the timing of transmission, the outcome may be spontaneous abortion, stillbirth, or severe disabilities if the fetus survives. For example, untreated syphilis in pregnant women can result in infant death in up to 40 percent of cases.