4 years old poop is black n watery.

A. hi are you giving iron drops to your child? if yes then black stool can be result of it but as child having watery stool too,it can be infection,so please visit your pediatrician for once give homemade freshly cooked food items give curd, Buttermilk more offer few sips of water or nimbupani at regular intervals of 2 or 3 hours