My son is 4 year old and he has been passing white colored frothy stool for 4 days. He vomited 2 times in these 4 days. Complaining of little stomach ache. Activity has decreased a little but not completely stopped. Eating almost normally and going to school and doing other activities as usual. No fever or any other symptom.   We thought the decrease in activity might be due to arrival of our 2nd baby just a week back. But we are not sure now if its his health or state of mind. Can you please throw some light on what might be happening?