EBF: Whose baby has a fish intolerance?

M

How does it look like, how does the baby react?

Mine has like smelly dark brownish orange poo, he has hard time passing poo and gets a bit of a rash on his cheeks.

I have tried a lot of elimination diets. I personally was sure, it was dairy problem. But now I suspect the fish is problem. (i love to eat fish, and I also did take fish oil supplement every day) Don't know for sure jet, but still I already suspect it. What is your experience?