Infants experiencing dark green stool
may be suffering from a lack of intestinal bacteria. If an infant is breast-fed without being given formula it may not have developed bacteria in their digestive system which would normally help break down food. If your infant has only been feeding on one side, they may be missing the breast milk that has a high fat content. This milk assists in the digestion of the breast milk, and its absence can often result in dark green stool. Children who have been prescribed a clear liquid diet
may also develop green or watery stools
as their body reacts to the lack of solid food in their diet.
In order to avoid harding of stool proper hydration needs to be provided , if still problems persisted ask pedi to provide laxative or u can try using castor oil at home.