Congratulations. What a wonderful time for you!
I had four cats when our DS was born. All of them were cuddlers and one was well over 20 pounds. We were very concerned about then getting in with our DS especially since one of them liked to climb in the crib before he came home. We did not ever have any of the 4 cats jump in the crib with him. We even had a basket bassinet that was on the floor that we would put him in when we were in the family room and he was taking a nap. They would jump up on our laps when we were feeding him, sit next to us on the couch when we were holding him and even surround him when we had him on a blanket on the floor when we played with him, but they never got in his crib or bassinet with him. I agree with a PP, just wait and see what happens, and if he is sleeping in the room when you are not there just keep the door shut so the cat can't get in. Play it by ear. You have to spend so much money on baby stuff wait to see if you really need to spend the money on this.