A.G.
I second the previous responses!
First- get a new doctor. find someone who listens to your concerns and doesn't shrug you off. your baby should not be crying with bowel movements and having mucus in his stools.this is the time that he is building many vital functions/organs in his body and he needs to be absorbing as much from his breast mild as possible. when is intestines are inflammed and irritated his food will be moving through too quickly for him to get enough absorption. i think that many docs think to themselves 'is this something i have a drug for? no? ok, nothing i can do.' they are not thinking about how you can help grow the most healthy and happy baby possible.
Second- axe the coffee, any chocolate, dairy, wheat, garlic, onions and brassicca foods like broccoli, cabbage and kale.
Third- get a probiotic that is specific for babies. the only one i know about it called nytagen made by seroyal, a brand only available through doctors. i know for a fact you can get it at the Natural Health Center on SW 1st ave in downtown portland.
I can pretty much promise you that this will clear up within a week with diet changes and the probiotic.
let me know if you have any other questions. i have helped many patients with similar issues.