I'm really sorry to do this so early in the morning... DS2 is 14 months and for the last week or so his poos have been greenish. This morning it was a definite dark green - not even verging on khaki. In my experience, this isn't normal - he hasn't had anything overly green (he did have some broccoli for dinner but he has that most nights). He has had a bit of a cold. Should I be worried?