You will know if its diarrhoea, it smells

If the smell has gone foul than id show your plunket nurse or GP. Otherwise green poo's can be ok, fluro green though doesnt sound quite right..
It might be a case of not getting enough of the fatty hind milk...Jake went through a phase of this when my supply settled and he had to work a little harder to get it. He would take the letdown for the foremilk but wouldnt work to bring down the hind milk. Ask your Plunket nurse to show you how to do breast compression while you are feeding to help that milk come down. (if you dont already know

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Jake was doing a poop with EVERY feed at 8 weeks!!!! He was a poop machine