CMV (Cytomegalo) virus infection can occur throughout pregnancy. Therefore, the earlier the mother is infected with CMV, the higher the risk of health problems and birth defects for the baby, especially in the first 3 months of pregnancy. In addition, in a few cases, the baby can be infected with CMV virus during labor or while breastfeeding. Therefore, diagnosing CMV for mother and fetus is very important in disease prevention and treatment.