Current concern :black color stool, smell difference, slight weakness, night time crying, low food intake. My son 2 year 2 months now, 2 months before we consulted physician as the child seems irritated during night ,crying and we felt like it may due to stomach pain. Weight not increasing as well. Labs test showed borderline iron level, hb normal, vita d low. Last 2 months he had iron syrup .now stopped 2 weeks back. Started pediasure from 10 days. Now stool black colour with above mentioned concern. Current weight: 10.9 kg, birth weight 3.2 please provide your valuable inputs. Thanks anish.