Can a fetus acquire cytomegalovirus without knowing?

They often do. If a woman never had a CMV infection prior to pregnancy, she is susceptible.Since the infection is often dismissed as a mild flu in adults, a mom may experience it during pregnancy, transmit it to the fetus & never know either had it until baby shown up with features of a congenital infection. If acquired late in pregnancy, the child may show few signs other than progressive hearing loss.