At 2–4 months of age, infants share an average of 35% of species with their mother’s microbiomes, with markedly greater sharing from the maternal gut than the vagina https://medicalxpress.com/news/2026-10-mother-microbiome-baby-clues.html Mother-infant sharing of gut and vaginal microbes at the species and strain level https://www.cell.com/cell-reports/fulltext/S2211-1247(26)00998-8 How does a mother's microbiome shape her baby's? New study offers clues