Bad gas breastfeeding

So I have tried diet change, avoiding certain foods that has been ineffective. I noticed I seem to constantly fart and it smells bad. Must be due to breastfeeding bc I never experienced before. Yoga class I can't even enjoy bc I'm trying to hold them in its horrible. I do eat fast bc my time is limited with a baby. Other then slowing down to eat what else can I do? Thanks in advance!