C.C.
Hi J.,
I somehow missed the pediatrician lecture on peanuts, and gave our daughter peanut butter on her toast from the time she was about a year old or so. I didn't think anything of it until our doctor asked what foods she was eating and I told him, and got a huge talking-to about it. I figured, what the heck, she hasn't reacted, she clearly isn't allergic, and she loves it, so I'm just going to go with it. I ended up doing the same thing with my second child and it was fine. I should say though that there is no history of any kind of food allergy on either side of our family so there was not much risk in my case.
My take on this would be that if your son has had peanut butter a bunch of times with no reaction, then he's probably fine with it. But - to me the larger question is, why is your daycare provider feeding your son things you don't want him to have?