If a CMV negative woman becomes infected during pregnancy, the fetus could become infected, too. This is known as a congenital infection and occurs in about one-third of cases.
Twenty percent of babies born with a CMV infection develop complications in their first few years of life. This may include:
- Low birth weight
 - Deafness
 - Blindness
 - Intellectual disability
 - Small head
 - Seizures
 - Jaundice
 - Brittle teeth
 - Liver or spleen damage
 
No baby develops all symptoms listed above, with the majority showing no symptoms at all.
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