Allergens

Hi all, I understand it would be fairly uncommon for a baby to have an anaphylactic reaction to a food they were allergic too - is this true? E.g you’re more likely to see hives / rash the first or second/third time and then it builds to a more severe reaction over time?

I just gave my 6 month old sesame (tahini) for the first time. She had a tiny amount and then sneezed 4/5 times after but seems otherwise absolutely fine. She’s never sneezed more than once in a row. Would this be classed as a reaction at all? Seems a stretch but also a coincidence.