t sound as lactose intolerance. Viral
diarrhea (Rotavirus) is common
in children younger than 5 years,
and some immunity develops after that, so it would be unusual to have 4 consecutive bouts of diarrhea from the virus.
What is the color and consistence of his stool? How many times a day? He is complaining (or you suspect) about school problems? Any abdominal pain, if yes, where exactly?