Children with autism spectrum disorder (ASD) can occasionally have their diagnoses made before they turn two. In the first three years of a child’s existence, they usually start to show.  Some ASD children who had appeared to be developing normally up until that point start to decline just before or sometime during their second year. Early autism diagnosis and treatment are more likely to have significant long-term positive impacts on symptoms and developing skills. A young child’s brain is still forming during this time, making it more “plastic” or changeable than at later ages. Early interventions take place at or before preschool age, as early as 2 or 3 years of age. This plasticity increases the likelihood that treatments will be successful over the long run. Children who receive early interventions not only have the best possible start in life, but also the best chance of reaching their maximum potential. Some autistic children who receive early intervention make such significant strides that, as they get older, they are no longer considered to be on the autistic spectrum. Early intervention programmes assist kids in learning the fundamental abilities that they typically acquire during the first two years of life. A child’s life can be significantly changed by an early diagnosis and course of ASD therapy. Many autistic toddlers benefit greatly from behavioural therapy. The sooner a kid can begin therapy, the more likely it is that they will improve as adults in terms of their skills. The primary signs and symptoms of autism cannot be treated with a single therapy. On the other hand, there are some treatments and medications that can significantly benefit kids and people with autism spectrum disorders. Speech language therapy, behavioral therapy, cognitive behavioural therapy, and school-based therapy are among the most efficient forms of ASD care. Professionals from numerous fields collaborate in India in order to offer the best services.