Looks interesting.
 A. Bergstrom, T. H. Skov, M. I. Bahl, H. M. Roager, L. B. Christensen, K. T. Ejlerskov, C. Molgaard, K. F. Michaelsen, T. R. Licht. Establishment of Intestinal Microbiota during Early Life: a Longitudinal, Explorative Study of a Large Cohort of Danish Infants. Applied and Environmental Microbiology, 2014; 80 (9): 2889 DOI: 10.1128/AEM.00342-14
We know that babies are born without bacteria in the gut.  And we know that important 'good' bacteria arrives in babies' digestive systems from their mother's milk.  But in this study, scientists said: "We are excited to find out that bacteria can actually travel from the mother's gut to her breast milk.  We're not sure of the route the bacteria take from gut to breast milk but, we have used culture, isolation, sequencing and fingerprinting methods to confirm that they are definitely the same strains.”

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