We had the same problems with baby rice at first and it gave my DD a really uncomfortable tummy. So I stopped the rice and introduced fruits and veg, slowly to start with until she got used to each one over a few days. Pears were my first choice and she loves them and they really clear her out and so does sweet potato. We have been lucky as my LO has always suffered with constipation and now on fruit and veggies twice a day she fills her nappy three times most days!! I have now slowly started adding small amounts of rice back in with her fruit purees, building up the amount and she has been fine with it now. I think until her tummy got used to solids the rice was just too much for her to digest. Hope your LO is ok and good luck if you try fruits and veggies.