Two recent studies provided information on the transmission of bacteria from mother to newborn.
The first one, from Milani et al., found with PCR analysis of the mother’s stool and milk samples and of the infant’s stool samples, that a Bifidobacterium breve and Bifidobacterium longum subsp. longum strain were transmitted from mother to child, and were persistent in the child’s gut 6 months later.
The second study, from Dotterud et al., used 16S ribosomal RNA in a randomized controlled trial to confirm that probiotic strains given in milk to pregnant women from 36 weeks of gestation to 3 months postnatally (while breastfeeding) were present in the mother’s own stool. One of the probiotic strains was recovered in the stool of the children at 10 days and 3 months of age, but there were no differences between the gut microbiota of the children in the control group and those in the probiotic group at 1 and 2 years of age. The authors concluded that there was no long-term vertical transmission of the probiotic strains.
Kristina Campbell Science writer Kristina Campbell (M.Sc.), from British Columbia (Canada), specializes in communicating about the gut microbiota, digestive health, and nutrition. Author of the best selling Well-Fed Microbiome Cookbook, her freelance work has appeared in publications around the world. Kristina joined the Gut Microbiota for Health publishing team in 2014. Find her on: Google • Twitter