Research identifies maternal and sibling influences on infant gut microbiome

Recent scientific studies have provided new insights into the factors shaping the development of the human gut microbiome in early childhood.

A study published in Cell Reports by CU Anschutz examined 68 mother-child pairs, finding that infants aged two to four months share an average of 35% of their gut microbe species with their mothers. The research indicates that the majority of these shared microorganisms (33.7%) originate from the maternal gut rather than the birth canal. Factors such as mode of delivery and nutrition also significantly influence which bacterial groups establish themselves first.

Complementary research from RIKEN and Chiba University, utilizing data from the Japanese Eco-Chill cohort study, explored the impact of family structure on microbial diversity. Analyzing stool samples from children aged two and four, researchers found that growing up with older siblings correlates with higher bacterial diversity. Specifically, four-year-olds with two or more older siblings were significantly less likely to exhibit a low-diversity microbial profile characterized by low propionic acid concentrations, a metabolite essential for metabolic and immune regulation.