A.P.
Yep, I agree, either dr or different formula. My daughter did the same thing and we had to try several formulas, then finally had to do a a rice based one with cereal added in order for her to keep it down. We lived with towels under her and piled up everywhere for about a week and a half before we found the right combination. If she's six monhts old, have you tried any baby food recently? There's lots of things around that age that could be triggering it. I'd probably take her to the dr first just to rule out sickness. And they would probably have samples of different formulas to try. Good luck.