1. Usually, CMV is sexually transmitted. So, your wife has high chances to get infected if you go for unprotected sex.
2. Commonly, the CMV trans-passes the placenta; thus, can be transmitted from pregnant mother to baby anytime.
3. No one can predict if your baby will be defective. If your wife will get CMV before getting pregnant, and her IGG
would come positive as you, then the chances to have defective baby are less if your IGG was negative and IGM positive (recent or recurrent infection).
At last, I strongly suggest to consult infectionist and OG before planning for a baby. Apply good hygiene too.
All the best!