My son is two-last Thursday he had a very pale yellow stool. Before the bowel he had been constipated for a couple of days. The bowel had a large hard part and then the rest was diarrhea. He finally had another bowel today after a whole week without going. It also was pale yellow and was hard. It was about the size of a tennis ball. I took him to the pediatrician on Saturday and they said it was probably nothing, just to do what I had been doing with natural remedies to help him go. They did not do any work up at all. I am just concerned. What should be my next step?