Is it possible for baby to get infected in the sac?

Yes. The developing fetus shares a blood connection with mom through the placenta. Any germ that enters moms blood may infect the fetus & cause injury or death.This could be as simple as the flu, or as bad as syphilis (std). The sac will protect baby from genital germs unless or until the sac opens prior to or during labor.Invasion of a small hole in the sac by group b strep is often fatal.