Bananas and rice cereal were the cause for DS, we cut them out altogether for a few months. Pureed and strained peaches or prunes worked, and also the Gerber apple-prune. The nurse told me to only give prune juice which is labelled for babies because regular prune juice can have fibers in it, which could cause choking in a young baby. Maybe over-cautious, but I stuck to the baby apple-prune. I never managed to find straight baby prune. Good luck!