He just had a second kid?
What are you referring to exactly? I assumed you meant the adapter that goes on the stroller, allowing you to put the infant car seat on the stroller. You don't need 2 of those (unless you have twins).
ETA: And if you're referring to the GoGo Babyz Kidz Travelmate (allows you to wheel a convertible car seat), he likely won't need 2 of those either. In the infant car seat goes on the stroller anyway. And once the baby is out of the infant car seat, Rafi will be big enough that he won't need it.