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Updated: Mar 18, 2026

Oral Biofilm Sampling for Microbiome Analysis in Healthy Children
Published on: December 31, 2017
The microbiome in early life: implications for health outcomes
Sabrina Tamburini1, Nan Shen1, Han Chih Wu2,3
1Icahn Institute for Genomics and Multiscale Biology. Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, New York, USA.
Insights
Early life microbial exposures significantly impact infant gut microbiome and immune system development. Understanding these factors is crucial for preventing childhood diseases and developing microbiome-based therapies.
Area of Science:
- Microbiology
- Immunology
- Developmental Biology
Background:
- Host genetics, prenatal environment, and delivery mode influence the newborn microbiome.
- Postnatal factors like antibiotics, diet, and environment further shape infant microbiome and immune system development.
- Early microbial exposure is hypothesized to offer protective effects in newborns.
Purpose of the Study:
- To review how prenatal and postnatal factors shape the early-life microbiome and immune system.
- To discuss the potential of microbiome-mediated therapeutics.
- To highlight the need for improved methods to restore healthy gut bacteria.
Main Methods:
- Literature review of recent studies on infant microbiome and immune system development.
- Analysis of epidemiological data linking early-life microbiome alterations to disease risk.
- Synthesis of current knowledge on factors influencing microbial community composition in infants.
Main Results:
- Prenatal and postnatal factors play critical roles in establishing the infant microbiome.
- Alterations in infant gut bacteria during childhood are associated with increased disease risk.
- The early-life microbiome and immune system are intricately linked and co-develop.
Conclusions:
- Understanding early-life microbiome development is essential for pediatric health.
- Microbiome-mediated therapeutics hold promise for treating various conditions.
- Developing strategies to shift pathogenic to homeostatic bacterial configurations is a key future direction.
Abstract:
Recent studies have characterized how host genetics, prenatal environment and delivery mode can shape the newborn microbiome at birth. Following this, postnatal factors, such as antibiotic treatment, diet or environmental exposure, further modulate the development of the infant's microbiome and immune system, and exposure to a variety of microbial organisms during early life has long been hypothesized to exert a protective effect in the newborn. Furthermore, epidemiological studies have shown that factors that alter bacterial communities in infants during childhood increase the risk for several diseases, highlighting the importance of understanding early-life microbiome composition. In this review, we describe how prenatal and postnatal factors shape the development of both the microbiome and the immune system. We also discuss the prospects of microbiome-mediated therapeutics and the need for more effective approaches that can reconfigure bacterial communities from pathogenic to homeostatic configurations.
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