my baby passes slightly black colored stools. he also passes stools after every two three days. what is the problem?? and wat is d diet to be followed?? is it because of cow's milk?? I use it in oats and ragi

A. baby is constipated that is why he is passing stools after 2-3 days so include more fibre in the title like dates Chiku prunes seasonal fruits vegetables keep am well hydrated and provide proper physical activity