Since this weekend, my 3 week old has had on and off green poop. Sometimes it is the consistency of the mustard-like poop (but green) and then she just had a very frothy green poop. It feels like she is constantly pooping, but it's at regular intervals, so I am not sure I would call it diarrhea. I am trying to make sure I just feed from one breast to make sure she's getting the hind milk, too. She also has a pretty bad diaper rash. I never had this with my son...any insights or advice? Should I call the pediatrician?