Does anybody know what this could be caused from? He went for his 4 month check up on Tuesday but his cheeks weren't as red and they said it could be from the cold (we live in buffalo ny). But we always keep him bundled up and we have a car seat cover to protect him from the wind. There hasn't been a change in his diet and we haven't used any new products recently like soap etc.. My little peanut is already trying to pop 3 teething though so I thought maybe that's what it could be. Any ideas? Calling doc if not better by Monday.