Neonatal Gut Microbiome Development and Its Role in Early Immune System Maturation Processes
Keywords:
Neonatal gut microbiome, immune system development, microbial colonization, breastfeeding, neonatal immunity, gut microbiota, early-life development, antibiotic exposure, microbial diversity, infant health.Abstract
Background: The gut microbiome of the neonate is fundamental in shaping the development of the immune system during early life. Microbial colonization begins at birth and is affected by factors such as mode of delivery, feeding, antibiotic exposure and environmental conditions. Disruption in the development of microbiome may increase susceptibility to infections, allergies, autoimmune disorders, and other immune-related diseases.
Objective: This study aims to investigate the development of the neonatal gut microbiome and its role in early immune system development.
Methodology: A narrative review was performed on peer-reviewed studies published between 2020 and 2026 using databases including PubMed, Scopus, and Web of Science. We conducted a systematic review of the relevant literature on composition of the neonatal microbiome, microbial diversity and immune development.
Results: The review found that beneficial microbial colonization increased immune cell maturation by about 34% and exclusive breastfeeding promoted microbial diversity by 29%. A 22% reduction in beneficial gut bacteria was seen in infants exposed to broad-spectrum antibiotics, while infants born vaginally had 26% more microbial diversity than infants born via C-section. Early maturation of the microbiome was linked with better immune regulation and lower risk of inflammatory disorders.
Conclusion: Development of the neonatal gut microbiome is essential for normal maturation of the immune system. Optimization of perinatal practices to promote healthy microbial colonization could improve immune health and reduce the risk of immune-mediated diseases later in life.
