What Can Early Intervention Really Do for Your Child with Autism?
In fact, though, early intervention is very unlikely to actually "cure" an accurately diagnosed case of autism. And later intervention isn't useless at all: kids and adults with autism continue to grow and develop throughout life.
So...


Comments
I don’t think one should give up because they were diagnosed later. Some autistic children who cannot talk have use of sign or computer based communication devices.
With early intervention
40% of children will talk fluently and 5% will have no signs
http://www.sciencedaily.com/releases/2004/06/040616063622.htm
Those are simular to the aba rates of high-test. Most Early intervention usually includes integrated play and some also ads speech. It’s varies from child to child because children need different things. That is the brilliance of early intervention and why it’s so effective.