Pumped breast milk exposes newborns to different bacteria then milk directly from the breast. The discovery, which researchers say is a surprise, suggests breastfeeding practices could shift the makeup of microorganisms in infants’ digestive systems.

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Pumped breast milk exposes newborns to different bacteria then milk directly from the breast. The discovery, which researchers say is a surprise, suggests breastfeeding practices could shift the makeup of microorganisms in infants’ digestive systems.