2 mo old baby passes lots smelly farts. poop mustard yellow, smelly. sometimes in pain. formula and breast fed. tried ovol, gripe, massage. concern?

Baby poop: What you are describing all sounds very normal. The poop is a reflection of the bacteria in the baby's gut as well as your diet (as you are sometimes breast feeding). Babies often cry when trying to have bowel movements - it's a new thing for them and they have to learn how to relax a sphincter and at the same time are bearing down to push the stool out - they get frustrated/cry - it gets better