We found out my middle kid had a soy and canola oil allergy at 2.5-3...luckily never got to the point of not breathing, but do have epipens. Breaks out in hives and has 'difficulty' breathing, said it feels like her throat and chest were tightening. Basically had to switch her to an all raw diet, which she didn't mind, she primarily ate fresh produce anyway...aside from snacks (where the soy/canola oil are damn near the top ingredient). However, seems she's grown out of it, and we found out accidentally. Wife freaked out one day at school pickup when she got there a little earlier and saw kids sharing/trading/snacks. Apparently, this had been going on for months. Teachers were/are aware of the allergy, but understandably can't give my kid 1 on 1 attention, especially at pick up. After digesting this information, took her back to the allergist, and absolutely nothing registers. But I'm still pretty nervous it could come back with a vengeance some day.