My 10 week old baby who is down to one breastfeed a day and has been formula feeding since 6 weeks has had a pasty dark green poo. Is this normal? He has had a cold and bit of a cough the last week and a temp of 37.3 deg but the doc says this is very low grade and to just use a vapouriser. I haven't given him panadol today and he has just had a breastfeed right before he did this strange poo. He did do a couple of green ones when he was about 2 weeks old. But they say in breastfeeding babies the odd one is ok. What about in formula fed babies? He wasn't feeding as well as he usually does becuase of the blocked nose but has been feeding fine last night and today. I was giving him karicare (the thick one) then changed back wednesday to the normal one. Could this have done it?