Early Intervention in Autism: Why the Earliest Years Matter Most As a clinical psychologist who has witnessed the transformative power of early intervention, I cannot overstate how profoundly the first few years of a child's life matter when it comes to autism. The brain during infancy and early childhood is experiencing its most dynamic period of growth and change, forming millions of neural connections every second and establishing the foundational networks that will support all future learning. This remarkable plasticity—the brain's ability to reorganise and form new connections—is precisely why early intervention can make such a significant difference in the developmental trajectory of autistic children. When parents ask me why we emphasise early intervention so strongly, I explain that we're working with the brain at its most flexible moment. During the first five years of life, neural pathways are still being established and refined. Experiences during this period lit...