Click on the Health Page icon on the top right hand side of this forum page. I have posted the DSM IV diagnositic criteria for autism and parents have posted examples of their child's behaviour that fits the criteria. That might help you get a better idea of what the professionals are looking for when they suspect an autistis spectrum disorder.
Sorry, this post was meant to go in the Health Page section, where I have now also put a copy. And people have posted examples of the behaviours behind the diagnosis so that will help people have an idea of what the professionals are looking for when they observe children.
The Health Page is on the top right hand corner of this forum page.