Social communication, behavior, and sensory processing difficulties characterize the complicated neurodevelopmental disorder known as autism spectrum disorder (ASD). For impacted children, improving outcomes and changing developmental trajectories need early diagnosis and intervention. This review explores the current understanding of ASD’s causes and risk factors, emphasizing the role of both genetic predispositions and environmental influences in early brain development. It highlights the importance of recognizing early warning signs, utilizing validated screening tools, and involving parents, educators, and healthcare professionals in the diagnostic process. The paper further examines a range of evidence-based early intervention strategies—including behavioral, educational, therapeutic, and technological approaches—that are most effective when implemented during the first years of life. Additionally, the review discusses demographic disparities in diagnosis and access to care, underscoring the need for equitable and accessible early identification systems. By consolidating existing knowledge and emerging practices, this paper aims to support more timely, personalized, and impactful interventions for children with ASD and their families. Recent breakthroughs in non-invasive brain stimulation methods, including transcranial magnetic stimulation (TMS) and transcranial direct current stimulation (tDCS), have demonstrated significant therapeutic potential in autism spectrum disorder (ASD).
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