My 2 year old is very healthy, clearly not malnourished but I m ready to potty train and she rarely - very rarely - ever has a solid stool. And, every now and then, it s watery, dark, sandy, gritty, and burns her bottom raw in one BM. The last couple of times this happened, it was after ample amounts of bread/wheat products. Could this be celiac s disease? Should I go to the pediatrician or straight to a pediatric gastroenterologist?