Developmental disorders can comprise a lot of different type of disorders from language disorders to autism spectrum disorders. 
There is a lot of people out here with autism do you know many?
No but it can be hard to diagnose because it isn't usually show in the first two or three years of a childs life. 
I think there is a lot of research out there but I think it needs to be a lot more.
That's true but there is also some bad research out there like junk science that says vaccines cause autism. 
I'm sure there is some bad research out there but not really sure I trust the vaccines either.
Vaccine
A vaccine is a biological preparation that provides active acquired immunity to a particular disease. A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe, its toxins, or one of its surface proteins. The agent stimulates the body's immune system to recognize the agent as a threat, destroy it, and to further recognize and destroy any of the microorganisms associated with that agent that it may encounter in the future. Vaccines can be prophylactic (
so it can be tricky to diagnose milder cases of autism in toddlers. The unspoken assumption is that by the age of five, unusual behaviors will either resolve or develop into diagnosable autism. However, some parents view the PDD label as no more than a euphemism for autism spectrum disorders, problematic because this label makes it more difficult to receive aid for early childhood intervention.
Diagnosis Classification.
The pervasive developmental disorders are:
- Pervasive developmental disorder not otherwise specified (PDD-NOS), which includes atypical autism,