J.C.
My first son (breastfed also) never liked the cereal you mixed from the box. I mixed it with breast milk and even tired water but he would never really eat it. The only way he ever ate cereal was the kind that's already mixed in with something else. The kind you buy in the baby food jars that you don't have to do anything to. It was usually rice and applesauce or some other kind of fruit. He never gave me any problems with it when it was like that! Good luck! Mine's 3 yrs. old and is still a finicky eater!