Similarly, there is some sensibility behind the idea of waiting between food introductions. Nearly all allergies are caused by one of a few foods—milk, eggs, peanuts, and tree nuts—and it’s sensible not to introduce these foods all at the same time. But most people are not allergic to most things. Yes, you can have an allergy to peas, but this is very uncommon. This doesn’t mean there is anything wrong with the every-three-days plan, and based on other evidence that kids need to try a food a few times before they like it, there may be a reason to focus on adding new foods one at a time. On the
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