<s>[INST] My little boy is 8.5 months old and for the last 3 days his stool has been like mush, kind of green, and smells very acidic. When you first smell it you would think it was vomit. We have yet to experience this and are not sure what might be the cause? [/INST] Hi...this looks like viral diarrhea. Once it starts it will take 5-7 days to completely get better. Unless the kids having low urine output or very dull or excessively sleepy or blood in motion or green bilious vomiting...you need not worry. There is no need to use antibiotics unless there is blood in the motion. Antibiotics might worsen if unnecessarily used causing antibiotic associated diarrhea. I suggest you use zinc supplements (Z&D Chat Doctor.  </s>