Hey Mama - you are right to be concerned! Any time your kids have such loose stools that you are concerned, you should tell your doctor in a way that they LISTEN. It's not ok for the baby to have diarrhea. It very very strongly sounds like a food reaction. I might be gluten, but it also might be dairy (the #1 culprit for Americans with gut disorder - Gluten is #2). It can also be rice, corn, egg, or a number of other foods. If you are breastfeeding, it can come through your milk (my son is milk sensitive (not even allergic) and whenever I ate cheese or anything dairy, he would get the rash). So #1 try quitting dairy yourself and see if that helps her. If you stopped the rice cereal and she still has diarrhea, that would be my best recommendation. Rice allergy is rarer than most food allergies, but not unheard of, because doctors (and cereal companies) recommend it at such a young age, before babies have had time to develop the right stuff in their tummies to process the rice, and it creates an auto-response in the gut to *get it out* which results in diarrhea. Only a sensitivity/allergy, though, would explain the rash, if those two things are linked. IF they ARE linked, you would need to figure out EXACTLY which foods are causing her problem by eliminating them until she is symptom free and then re-introducing the offending food to check and be sure that it is causing symptoms. There is such a thing as the elimination diet, but as long as you are pretty sure you can figure it out w/just a few foods, you can probably start with that. The diet itself is BRUTAL and requires much more of the mother, than the baby in denying yourself a lot of foods. But you can read more about it all here. http://www.askdrsears.com/html/4/t041800.asp Even though it is a pain, having a baby or child with chronic diarrhea is dangerous and unnecessary.
You can also give your babe probiotics, which are safe and healthy for anyone of any age. You can get them at any health food store. Mention that you want dairy free ones, and also ones that you can dilute with boiled (but not hot) water and then just drip them into your baby's mouth when she is willing (or sleeping). These probiotics will reintroduce some of the good bacteria that help to break down food in the gut. If it is a virus, not an allergy, it should help her on the road to recovery.
I really hope your answers come quickly and easily, mama!