I can find no information that indicates the specific risk of congenital cytomegalovirus
in subsequent pregnancies.
It may be of some comfort to you that the above reference indicates that
only 10% of children who are infected develop symptoms -- although 15%
of infected children with no symptoms at birth do develop problems later.
I'm sorry that I could not provide a more complete answer to you -- but
I'm sure that your doctor can provide you with a quick and complete
answer to this important question.
My condolences on the loss of your precious child.
Let me know if you need more input. If not, thanks for the
opportunity to assist you... I would really appreciate your honoring my
efforts by 'pushing the button' and Accepting this answer. Adding
a bonus -- should you wish to do so -- is always warmly welcomed.