If the baby catches CMV in the womb, it may cause 'silent' infection that does not cause any particular adverse sequalae, even in childhood. Alternatively, it may cause blindness, mental impairment or deafness that is only apparent in early childhood. The final possibility is that the infection may be so severe that there are obvious signs of the infection on ultrasound: extra fluid in the brain, a small head, calcification (white flecks) in the baby's brain, liver, intestine and spleen, and reduced growth. These features unfortunately point to particularly poor prognosis.