We've got a lot of different microbes in the gut, and we're supposed to have them, but they're all supposed to be in the right balance. (everywomanover29.com)
A variety of food feeds different microbes in baby's gut, which supports a flexible immune system. (mamas.whole30.com)
How the presence of different microbes influences the developing human infant immune system has yet to be determined. (scienceandsensibility.org)