Hey mama

My babe was having green, runny poos a little bit earlier than that. But, at about 5-6 weeks, it was accompanied by vomiting, stomach pain, etc. I took out dairy, but it didn't help much. Her pediatrician had me take everything out in my diet except for a few things. I'm still on that very restricted diet, but her poos are yellow and she seems less distressed. I will be adding in food one at a time.
If your babe is otherwise doing fine, then I wouldn't worry about it. However, if she is upset/gassy/in pain OR if she's not gaining weight OR if she develops rashes anywhere on her body, I would say that maybe you should start with eliminating dairy. For us, dairy didn't do much (but soy did!), but for so many, that's the real culprit.
The digestive systems of these babes are really weak and so we just need to make sure we are really gentle with them.