*Green Poop*

'Hi Could I have another PP please?

My little one is 9 weeks old and seems to have dark green poop! (Sorry for tmi!). It is not hard or like pellets or frothy! but it's been like this since she was about 3 weeks old. (Use to have mustard yellow) cocktail with green color ...
I have been to the doctors but they don't seem concerned even tho my daughter only goes once every 3-4 days!!
She has recently been diagnosed with colic and reflux and is on gaviscon, could this diagnosis be the reason for the green stools? Will the gaviscon help with this?'