My daughter was 9 months old when she had her first allergic reaction to food—scrambled eggs. Almost immediately, she began rubbing her lips and face uncontrollably. Helplessly, I watched as tiny pink hives began to appear all over her face. As a new mom, it was a terrifying experience. In hindsight, though, it was a relatively minor reaction compared to when she ate cashews and we had to rush her to the ER. And we would relive it again when some noodles at a restaurant made her lips swell. And then again when her little brother tried eggs for the first time.