No, but it is likely, since I doubt Walt did it himself, that Saul arranged the kid being poisoned by the lily of the valley flower, but it is hard to envision a scenario where Jesse would have Saul in a position where he would have to give that up, especially since Jesse doesn't know there is anything to give up, so Saul would have to blurt it out without provocation. Maybe if Walt double crosses Saul or something, but I just don't see it.