There's a lot of factors in that first three-year period that will determine some of your keystone species. It can be things like breastfeeding versus bottle, and it can be the type of food you're weaned onto. That can introduce microbes that are ones that we'll see as adults still. But you're not totally stuck with that. I mean, people who take antibiotics, they get repopulated, but they often will get repopulate with the same types of bugs again.

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