Please, please, please! Take your child to the pediatrician and demand that he be tested for diabetes. Don't take "no" for an answer. I am a Pharmacist and have a friend whose 1 year old son just died of diabetes -- they didn't know he had it and he was misdiagnosed. By the time they figured out what it was, it was too late. He went into a DKA coma (Diabetic Ketoacidosis) and died suddenly. I pray that I am wrong, but extreme thirst is a telltale sign. A simple blood glucose test would have saved his life. If he does have diabetes, I would recommend seeing a Pediatric Endocrinologist through All Children's Hospital - they have amazing specialists. Also, another sign of diabetes can be ketones on the breath -- which can smell like nail polish remover, sort of sweet-like. Please have him checked to rule this out -- it's a simple prick and a blood test and they may also test his urine to see if it has ketones or sugar spilling into it. Again, I hope and pray I'm wrong, but couldn't live with myself if something happened and I didn't say anything.
Wishing you the best,
Kristen (____@____.com)