Breast-Feeding the Microbiome

This is an edited excerpt from “I Contain Multitudes: The Microbes Within Us and a Grander View of Life,” which will be published on August 9th by Ecco, an imprint of HarperCollins Publishers. The Foods for Health Institute, at the University of California, Davis, has the appearance of a Tuscan villa, its terra-cotta-walled buildings overlooking a large vineyard and a garden that bursts with summe