Early-Life Microbiome Alterations and Their Role in Pediatric Neurocognitive Development

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Abstract
Early childhood represents a critical period for neurocognitive development, during which biological systems exhibit heightened plasticity and vulnerability to environmental influences. In recent years, increasing evidence has highlighted the gut microbiota as a key modulator of brain development through the microbiota–gut–brain axis. This review aims to synthesize current scientific evidence examining the relationship between early-life gut dysbiosis and neurocognitive development in children. A narrative review methodology grounded in the scientific method was employed to analyze experimental and human studies addressing microbial colonization patterns, biological mechanisms, and neurodevelopmental outcomes during infancy and early childhood. The findings indicate that early-life gut dysbiosis is consistently associated with alterations in cognitive performance, behavioral regulation, and stress responsivity, particularly when microbial disruption occurs during sensitive developmental windows. Immune modulation, microbial metabolite signaling, and hypothalamic–pituitary–adrenal axis regulation emerge as central mechanisms linking gut microbiota alterations to neurodevelopmental trajectories. Clinical and environmental factors such as antibiotic exposure, nutrition, prematurity, and socioeconomic context play a significant role in shaping early microbial ecosystems and related neurocognitive outcomes. Although the current evidence primarily supports associative relationships, the convergence of mechanistic and developmental data underscores the biological plausibility and clinical relevance of early-life gut dysbiosis in pediatric neurodevelopment. These findings highlight the importance of microbiome-informed perspectives in pediatric research and support future longitudinal and interdisciplinary studies aimed at optimizing neurocognitive outcomes in children.