My 4 year old grandson has been having diarrhea and vomiting on and off for the past three weeks. We have taken him to the Dr. and had a stool sample done. The sample game back normal. He has lost about three pounds, and my daughter has made another apt for tonight. He has a twin brother and a younger sister 1 1/2 yrs. They also had vomiting and diarrhea but it was over for them in a couple days. Connor s is not continuous, but he keeps re-appearing. A couple of days goes by and it s back. Now he doesn t want to eat and normally he s a good eater.