The integration of gut microbiota research into the understanding and treatment of neurodevelopmental disorders has profound implications for both clinical practice and public health. The microbial community’s influence on neural development through mechanisms such as microbial metabolites, immune regulation, and gene expression underscores the complexity of neurodevelopmental disorders like autism spectrum disorder (ASD) and attention-deficit hyperactivity disorder (ADHD). As research continues to unravel the intricate relationship between gut microbiota and brain function, innovative therapeutic interventions, including probiotics, prebiotics, and fecal microbiota transplantation, hold potential to improve symptoms and outcomes. However, the safety and long-term effectiveness of these therapies remain critical areas for future investigation. Advances in diagnostic tools and personalized medicine, which incorporate microbial biomarkers, offer exciting prospects for early detection and tailored treatments, ultimately improving the quality of life for individuals with neurodevelopmental disorders. Continued interdisciplinary collaboration is essential for translating these findings into practical solutions that address the underlying mechanisms of these complex disorders. This review highlights the critical role of gut microbiota in neurodevelopmental disorders, emphasizing the importance of microbial metabolites, immune regulation, and genetic interactions in shaping brain development.