Anyone have any advice from allergists/ peds or personal anecdotes regarding breastfeeding and food allergies?

LO1 received breastmilk for a few months and then switched to regular formula. He's allergic to peanuts and almonds, the only two nuts I ate regularly while I was still nursing. I often wonder if I contributed to his allergies although doctors have told me not to blame myself and there are mixed studies on this issue. I just can't help but wonder if he'd never been exposed to those nut proteins if it would have made a difference.

With LO2 coming I want to do my best to help her avoid allergies. I don't know if that means try to BF exclusively longer, don't BF at all, or if I should try avoiding the top allergens! It's so frustrating that there are no clear cut answers on these issues.

Any thoughts or personal experience???