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Updated: May 5, 2026

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Published on: January 9, 2026
The Gut in Early Life-Postnatal Challenges.
Marc Alexander Benninga1, Karl-Herbert Schäfer2, Hugues Piloquet3
1Department of Pediatric Gastroenterology and Nutrition, Amsterdam University Medical Center, University of Amsterdam, Emma Children's Hospital, Amsterdam, The Netherlands.
Neonatal development involves significant physiological changes influenced by diet, environment, and genetics. Establishing a healthy gut microbiota is crucial for infant development, impacting metabolism, immunity, and the gut-brain axis.
Area of Science:
- Neonatal development and microbiome research.
- Gut-brain axis.
- Microbiome modulation.
Background:
- Neonatal development is characterized by rapid physiological changes.
- The gut microbiota plays a critical role in nutrient metabolism, immune function, growth, and the gut-brain axis.
- Early life is a critical window for establishing a healthy infant microbiome.
Purpose of the Study:
- To review challenges in defining a "normal" neonatal microbiota.
- To discuss modifiable external factors influencing early-life microbiome development.
- To explore new approaches for targeted microbiome modulation in infants.
Main Methods:
- Review of current research on neonatal development and microbiome.
- Analysis of factors influencing gut microbiota establishment.
- Discussion of advancements in sequencing technologies for microbiome characterization.
Main Results:
- A healthy, symbiotic gut microbiota is essential for normal infant development.
- Term-born, exclusively breastfed infants not exposed to antibiotics serve as a "gold standard" for microbiota development.
- Advances in sequencing enable strain-level identification and personalized microbiome modulation strategies.
Conclusions:
- Defining a "normal" neonatal microbiota remains challenging.
- External factors, including diet and antibiotic exposure, significantly impact early-life microbiome development.
- Targeted microbiome modulation holds promise for supporting healthy infant development, including for formula-fed infants.
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