thank you for your query.enterogermina
are both types of pro-biotics that are used for gastro-intestinal problems.but both require to be taken for atleast 5-7 days for them to be completly effective.
Children over three months are recommended to take two doses of 250 mg a day (BID) for five days to treat acute diarrhea
hence i would recommend you to take econorm for a minimum of five days.
also,i would advise your son to
-take lots of fluids
-fiber containing diet
-include green vegetables in diet.
wishing you good health