Infant gut microbiome (IGM)

The infant gut microbiome is a complex and dynamic ecosystem of microorganisms that colonizes the gastrointestinal tract shortly after birth and plays a fundamental role in early-life development [1, 3, 5]. It is primarily characterized by the initial dominance of Bifidobacterium species, which are specialized to metabolize human milk oligosaccharides (HMOs) into beneficial short-chain fatty acids that regulate host immunity [4, 10, 15]. This microbial assembly is critical for the education of the host immune system, helping to establish tolerance and protect against pathogen colonization, while also influencing neurodevelopment through the gut-brain axis [3, 7, 9, 13]. Perturbations to this system, known as dysbiosis—often caused by Cesarean delivery, formula feeding, or early-life antibiotic exposure—are linked to increased risks for several conditions, including necrotizing enterocolitis, asthma, and childhood obesity [1, 2, 6, 11, 18]. Therapeutic strategies increasingly focus on modulating this ecosystem through probiotics, prebiotics, and microbial ecosystem therapeutics to restore a healthy developmental trajectory and prevent chronic disease [10, 12, 14, 17].

Other names

Neonatal gut microbiotaInfant intestinal floraInfant gastrointestinal microbiomeNeonatal microbiome

Modulation of the microbial composition and metabolic activity to restore eubiosis, educate the host immune system, and produce beneficial metabolites like short-chain fatty acids (SCFAs) while providing competitive exclusion of pathogens.