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Human breast milk microbiome changes over time

The microbiome of breast milk is influenced by many factors, including maternal weight and how the baby was delivered, according to research published in the American Journal of Clinical Nutrition.

Raul Cabrera-Rubio, M.D., of the University of Valencia in Spain, and colleagues used pyrosequencing and quantitative polymerase chain reaction methods to characterize the microbial community of the breast milk of 18 mothers at three different time points and identify pre- and postnatal factors that can influence the breast milk microbiome.

The researchers found that colostrum contained primarily Weisella, Leuconostoc, Staphylococcus, Streptococcus, and Lactococcus, while samples collected at one and six months contained more Veillonella, Leptotrichia, and Prevotella species. Obese mothers displayed a different and less diverse bacterial community. Additionally, the microbiome differed according to whether the baby was delivered vaginally or via non-elective or elective cesarean section, suggesting a role for physiologic stress and/or hormonal signals in the transmission of bacteria into breast milk

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