Adam- do not get the rotavirus vaccine unless you plan on him going to daycare. It is yes just a stomach flu that with modern medicine is super easy to handle- mostly just making sure they don’t get dehydrated. The vaccine is a live virus one so you three could get it from the vaccine anyway- plus it has a big black box warning about a rare but potentially life threatening side effect that is very hard to spot because it causes their intestines to fold in on themselves or something like that. The risk of that side effect significantly outweighed any risk from the actual disease for me so we skipped it.