Who do they think they are?

(I really need an outlet to vent, so here we go)
I am having a rough day (emotionally) because of a conversation that I had with Remi this morning. He is the type of kid that will be stewing over something for awhile before he will say anything to you. I haven't noticed anything wrong with him, but he has been extremely anxious for the baby to come. Aren't we all, right? It has surprised me a little with him though. Well, we were driving to the dentist and out of the blue he says to me, "Mom, R--- and J--- told me that our baby is going to come out dead". (These boys are two kids that he plays with daily at our babysitter's house. It is not the same kid that told Remi that his mom is fat.) When he first said this to me, I was a little shocked and didn't really react. I did answer him saying that everything with our baby is great and not to worry. The more I thought about it, the more pissed off I have become. Those little bastards!!!! Who do they think they are saying such things, especially to an 8 year old. I have no idea how long ago they said this to him and I don't really want to press him on it because knowing Remi he will read too much into it. So I have been going back and forth on do I talk to the babysitter and make a big deal of it or just let it go and not worry about it. I guess I should mention that the baby is perfectly healthy (as he is kicking the crap out of my ribs right now) and his health has never been an issue. I have no frickin' idea why they said that. I am upset that they have put this in his head, not because I believe that it will happen. Man I wish I was 8 again so I could beat the crap out of them.