Hi Health care magic user I understood your cocern , My explanation to your concern is that the infection to baby in womb occur through Mother Infections can develop in the fetus transplacentally, perinatally (from vaginal secretions or blood), or postnatally (from breast milk or other sources). The clinical manifestations of neonatal infections vary depending on the viral agent and gestational age at exposure. The risk of infection is usually inversely related to gestational age at acquisition, some resulting in a congenital malformation syndrome. Infections known to produce congenital defects are TORCH (Toxoplasma, others, rubella, cytomegalovirus , herpes) infection i hope my answer help you Thanks