hi, my baby is passing out dark green stool which is quite smelly eversince he changed milk powder from nan Pro to nan Ha. currently 3 months old. is dark green stool normal , as i asked the nurse she said it is quite normal. but not sure what is causing the dark green stool. previously when he was on nan pro,, his stool used to be mustard yellow but due to constipation have to changed to nan ha.