My 3 year old is sick again. He keeps throwing up and his stool smells really bad like a dead body. And when this happend, he want eat. So I've gave him pedialite and juices. He has no fever this time bur last month he did and he had the sane symptoms. I

Diet, Daycare ? Various factors. Most common ones is day care. Kids have numerous sick kids around them that can cause symptoms of viral gastroenteritis. Second would be any food intolerance. See if there is any recurrent symptoms with certain foods offered? You might want to try rotating his diet. Another would be parasites or bacteria in the GI tract. What ever the cause, make sure he is well hydrated.