Thanks for writing to health care magic.
Greenish color of the stool indicates that there is increased bowel motility. You need not worry about that.
Please monitor your kid for signs of dehydration
whenever he has loose stool
The signs of dehydration are...
1. dry mouth
2. Increased thirst.
3. Decreased urination.
4. Irritability or lethargy
5. Sunken eyes
6. Decreased skin turgor
Hope this helps