Hi- about a month ago, my 18 month old son begal to have loose, mushy stools with coffee gring like specs in it. After a massive explosion I finally took him to the doc n they did stool samples n found traces of blood. That was followed by a complete allergy test and is not allergic to any food or dairy, etc. He has also been consming extreme amounts of water. Thy did a urine test and there was no sugar in his urine. What could it b?