Around 13% of babies born with congenital CMV will have symptoms at birth. A similar number of babies who don't have symptoms at birth will develop problems at a later stage.
Symptoms of congenital CMV at birth can include:
Some of these symptoms can be treated, but some babies will develop long-term conditions as a result of the infection.
A small proportion of babies with congenital CMV (including those with no symptoms at birth) will develop one or more physical or mental problems at a later stage. These can include:
CMV infection is responsible for around 25% of cases of hearing loss during childhood.
Hearing loss caused by congenital CMV may develop during the first few years of life. This usually gets worse over time. It can also be permanent and range from mild to total.
The hearing problems can affect either one or both ears. Children with hearing loss in both ears are also likely to experience difficulties with speech and communication as they get older.