Since HPV is a viral infection, even when the warts are not visible, the virus remains in the body. Although uncommon, it is possible for the infant to contract HPV from an infection in the birth canal. In these cases, warts may form in the windpipe. If a woman infected with HSV-2 is not having symptoms during her pregnancy, there is a low risk of transmission to her infant. It is possible, however, for the virus to pass through the placenta during pregnancy.
Transmission can also take place in the birth canal.
One third of infants infected during vaginal delivery die. Syphilis Syphilis can cause stillbirth and miscarriage. The longer a woman is infected with syphilis, the lower the chance is that her infant will be born infected. Infants born to women with syphilis may look normal at birth. Onset of symptoms is usually two weeks after birth.