My son is 28 months and we have self diagnosed him with Celiac. Once we removed the soy from his diet he made great improvement with his digestive issues . He has always had a dairy issue and was on soy formula and then soy milk. We are still working it out but it is WAY better than it used to be. He would have great expressions and just babble on and on but he would not say any words. At his 2 year checkup I asked his doctor if I should be concerned and she said if he can say 50 words he should be ok if not we will have his hearing checked. I knew he could understand us he just couldnt