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Development of Human Microbiota01:30

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The human microbiota begins developing at birth and undergoes continual change as we age. Infancy marks a critical period of microbial sensitivity, offering a “window of opportunity” during which beneficial microbes help mature the immune system. By age three, children typically develop a more stable and diverse microbial community. Newborns acquire microbes from their immediate environment; vaginal delivery favors maternal vaginal microbes, while cesarean births favor microbes from...
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The establishment of the oral microbiome begins before birth, challenging the long-held belief that the fetal oral cavity is sterile. The presence of oral microbes such as Streptococcus and Fusobacterium in amniotic fluid suggests that microbial exposure may occur in utero, potentially through translocation from the maternal oral or gastrointestinal tract. This early colonization primes the neonatal immune system and sets the stage for subsequent microbial succession. Maternal health,...
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The gut–brain axis is a bidirectional communication system that connects the gastrointestinal tract and the brain. This interaction is mediated through multiple pathways, including the vagus nerve, hormonal signals, immune responses, and chemical messengers produced by gut microbes.Microbial Contributions to Brain FunctionGut microbiota contributes significantly to brain function by producing neuroactive compounds. These include neuroactive compounds that influence neurotransmitters such...
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Microorganisms colonize various regions of the human body, including the mouth, nasal passages, throat, stomach, intestines, urogenital tract, and skin. The total number of microbial cells is estimated to range from 10¹³ to 10¹⁴—comparable to, or exceeding, the number of human somatic cells. This host–microbiome relationship has led to the conceptualization of humans as supraorganisms, wherein microbial communities perform vital roles in development, immunity,...
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Early-Life Microbiota Modulation and Neurodevelopment in Infants: A Systematic Review and Meta-Analysis of Randomized

Salvatore Michele Carnazzo1, Fabio Allia1, Alice Foti1

  • 1Department of Medicine and Surgery, University of Enna "Kore", 94100 Enna, Italy.

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Summary

Microbiota-targeted interventions like probiotics show potential for enhancing infant neurodevelopment. This systematic review explores their impact on cognitive and behavioral outcomes in infants aged 0-36 months.

Keywords:
early-life microbiota modulationgut microbiotagut–brain axisinfant neurodevelopmentprebioticsprobioticsrandomized controlled trialssynbiotics

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Area of Science:

  • Microbiome research
  • Neuroscience
  • Pediatric development

Background:

  • Early infant microbial composition influences neurodevelopment and behavior.
  • Microbiota-targeted interventions (probiotics, prebiotics, synbiotics) aim to modulate gut health and immunity.
  • Existing research shows associative human evidence and causal preclinical links, but a gap exists in focused neurodevelopmental assessments within the first three years.

Purpose of the Study:

  • To systematically review and meta-analyze randomized controlled trials on microbiota-targeted interventions in infants (0-36 months).
  • To determine if probiotics, prebiotics, and synbiotics provide discernible neurodevelopmental benefits.
  • To explore mechanisms linking microbial modulation to early brain development.

Main Methods:

  • Systematic review and meta-analysis of randomized controlled trials.
  • Inclusion of studies assessing probiotics, prebiotics, and synbiotics.
  • Focus on infants aged 0-36 months with neurodevelopmental and behavioral outcomes.

Main Results:

  • Analysis of randomized controlled trials investigating the impact of microbiota-targeted strategies on infant neurodevelopment.
  • Synthesis of evidence on cognitive, behavioral, and socio-emotional outcomes.
  • Identification of potential benefits and underlying mechanisms of microbial modulation.

Conclusions:

  • Microbiota-targeted interventions warrant further investigation for their role in supporting healthy infant neurodevelopment.
  • Understanding the gut-brain axis in early life is crucial for optimizing developmental trajectories.
  • Future research should focus on robust clinical trials to confirm efficacy and elucidate mechanisms.