We started solids on Saturday. The only thing he's had so far is organic baby oatmeal. He didn't poop the rest of the day on Saturday, Sunday or Monday. Finally, he pooped this afternoon. When DH changed him, he noticed DS' bottom was EXTREMELY red and sore. It's almost blistered and sort of shiny looking. The redness is localized on only one side of his bum where the poo had collected (he was lying on his side). Could this be some sort of allergic reaction to the food? We cloth diaper and he's never had this bad of a reaction before so quickly.