You are doing a fantastic job to still provide breastmilk to your lo - great work. I don't think though that there would be anything about the quality etc of the milk that would cause your DS problems if that's what you're asking. Sometimes babies that have a food sensitivity can react to it through breastmilk - that would be the most likely cause if it is something in the milk. The only way to really know is to go on an elimination diet to see if things improve. All the best with it hun.