With Josie we went thru several different cereals before we found one that didn't make her tummy hurt; I want to say we ended up with millet for her, and oatmeal for Natalie, but that's all so long ago now.
Maybe try foods that aren't cereal? Around this age we were starting to do bits of soft foods for the girls to pick up and (attempt to) feed themselves, if my bad eyes have read your Lilypie right. So things like soft cubes of carrot, bits of things we were eating. (And I didn't read it right - with my reading glasses NOW I can see the "adjusted age" so glad I looked again! LOL)