Human milk is a source of lactic acid bacteria for the infant gut.

By Rocío Martín, S. Langa, C. Reviriego, Esther Jimínez, M. Marín, J. Xaus, L. Fernández, J. M. Rodríguez. Jornal de Pediatria, 2003

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Isolation of Commensal Bacteria from Umbilical Cord Blood of Healthy Neonates Born by Cesarean Section (2005, background): “faecium HA1, a breast milk isolate [17], was selected to investigate the potential mother-to-child transfer of commensal bacteria through the placental barrier in a murine model.”
The First Microbial Colonizers of the Human Gut: Composition, Activities, and Health Implications of the Infant Gut Microbiota (2017, background): “The identified species associated with the umbilical cord are naturally present in infants immediately after birth (181, 182), being generally regarded as commensals in healthy infant hosts.”
The human milk microbiota: origin and potential roles in health and disease. (2013, background): “showed the predominance of staphylococci, streptococci, lactic acid bacteria (LAB), propionibacteria and closely related Gram-positive bacteria [4,5,18,19] (Table 1), including new bacterial species, such as Streptococcus lactarius [20].”
Establishment of the gut microbiota in Western infants (2009, background): “aureus have been identified in breast milk and infantile gut in mother-infant pairs (50,51).”