Correlation of alpha diversity with (left panel) postmenstrual age (Shannon: multiple R2 value, 0.1508; P value, 1.507e−06), (middle panel) total growth rate (in grams/week), and (right panel) ratio of the mother’s own milk volume to total milk volume. Correlation of alpha diversity with (left panel) postmenstrual age (Shannon: multiple R2 value, 0.1508; P value, 1.507e−06), (middle panel) total growth rate (in grams/week), and (right panel) ratio of the mother’s own milk volume to total milk volume. Alyson L. Yee et al. mSystems 2019; doi:10.1128/mSystems.00229-18