<s>[INST] My son was at a birthday party this past Friday where the children were out doors at a spring fed river. The next day, he wasn t feeling well (stomach didn t feel well, and headache). He has had diarrhea since Saturday. This was Friday evening and today, he has foamy light brown poop. What could be wrong? [/INST] Hi, Thanks for writing to Chat Doctor. I am Chat Doctor. I suspect that your child is having Acute gastroenteritis, may be secondary to infected food, or the river polluted river water. Kindly keep a watch on fever, repeated vomiting, too many loose motions, blood in motions, decreased activity and decreased intake of food. This would be signs to visit your pediatrician. Presently you may give the child ORS, 1/2-1 glass after each loose motion, Spy ODEM 5 ml 1/2 hour before food 3 times a day for vomiting.  Thanks. If you have any more queries I am happy to answer them. Else, please rate this answer and close the discussion. </s>