Our daughter recently developed EILO. It sounds silly and totally illogical, but more than once, I've found myself wondering if there is anything we could have done to have helped her avoid it.
So yes, that feeling just comes with being a parent, I guess.
Oh I see, thanks for explaining, you are rejecting the underlying science. What about the study do you not find convincing?
I certainly do no such thing.
>>What about the study do you not find convincing?
I do find it convincing, what I don't find convincing is OP's assertion that because they missed some time period in their daughter's life feeding her peanuts she developed a peanut allergy. It's not an "if X then Y" system - and the study does talk about it in terms of probabilities, not certainties.
Might it not have mattered? Sure. Might it have prevented their kid from getting the allergy? There's a decent chance.