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Individualized Reconstitution of Human Milk Microbiota: A Feasible Approach in Real-World Settings
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Seeding the Future: How Feeding Mode Shapes the Infant Gut Microbiota
Felicia Trofin1,2, Aida Corina Badescu1,3, Luminita Smaranda Iancu1,4
1Grigore T. Popa University of Medicine and Pharmacy Iasi, 700115 Iasi, Romania.
Microorganisms
|March 28, 2026
Summary
Breastfeeding supports a stable infant gut microbiota, while formula feeding leads to greater diversity. Differences in microbial function and immune programming persist despite formula advancements.
Area of Science:
- Microbiology
- Immunology
- Nutritional Science
Background:
- Early life nutrition and microbial exposures critically shape long-term physiological function.
- Infant feeding mode significantly influences gut microbiota assembly and metabolic activity.
- Breastfeeding (BF) and formula feeding (FF) have distinct impacts on infant gut microbiome development.
Purpose of the Study:
- To review and synthesize evidence comparing BF and FF in infants.
- To examine effects on microbial composition, functional capacity, and immune programming.
- To understand the implications for early-life nutritional strategies.
Main Methods:
- Narrative review of existing scientific literature.
- Comparison of infant gut microbiota in BF vs. FF groups.
- Analysis of functional pathways and immune modulation associated with feeding modes.
Main Results:
- BF promotes a stable, Bifidobacteria-rich microbiota with pathways for carbohydrate utilization and immune modulation.
- FF typically results in greater microbial diversity and an earlier shift towards adult-like profiles.
- Differences in microbial functional capacity and immune programming persist between BF and FF infants.
Conclusions:
- Early infancy is a critical window for nutritional programming of the microbiome and immune system.
- While formula advancements reduce compositional gaps, functional and immune differences remain.
- Further research is needed for microbiome-informed strategies to optimize infant nutrition and health.
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