What to do if a baby has an allergic reaction?

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So a post came up about baby foods. This got me thinking about allergies. My parents, siblings, and fiance are all allergic to certain foods. I'm fortunate enough to not be, but this made me think that I have no idea what to do if my child has an allergic reaction. I'm nearly half way in my pregnancy so I don't have to worry about it for a while, but I want to be prepared.

Edit: Actually, not true. I'm allergic to pork. I forgot about that since it doesn't react like a normal allergy. 😒