You are definitely correct, it is certainly possible that your son has a cow's milk protein intolerance. It would be worthwhile giving your son a completely milk/dairy free diet for at least one month. His stool should then be retested for blood. You will need a dietician's advice to achieve a safe milk free diet for your son. Only once you have tried this diet and if the bleeding is found to be persisting should your son have the scope done.
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