<s>[INST] my 2 year old son has had diarrohea somtimes vomiting over the last 3 days i thought it was gastro but this evening he has trouble walking his leg went from under him ,there are no sign of injuries it only seems to hurt when he stands not when pressed or moved around.he has had no temps [/INST] Hi,Diarrhea and vomiting indicates acute gastroenteritis, which is usually viral and need only supportive treatment with antiemetics and plenty of fluids like ORS solution to prevent dehydration.But presence of leg weakness need further evaluation. This may be from an electrolyte imbalance like hypokalemia or hypocalcemia. Although rare, GBS (guillain-barre syndrome) can also have a similar presentation. Kindly take him to your pediatrician, as this needs evaluation without delay. Meanwhile give him frequent sips of oral fluids to prevent dehydration.Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Muhammed Aslam T. K., Pediatrician </s>