Re: Cats and Infants
Babies are delicate and since you say your two Brother-Cats are very playful and do knock into you and your wife as they race around, I think it is a very good idea to protect the baby from their exhuberant play. They wouldn't mean to hurt the baby, but cats don't understand that babies are delicate, nor do they understand parent's being protective.
Just be sure to spend time with the cats, giving them love and personal attention so they know they are loved, too. This is going to be a very busy time for you and your wife and you just won't have the extra time to devote to your pets for a while, until the household adjusts, so just be sure the time you do spend with them you are able to give them some quality undivided attention.