T.Q.
Hi There,
I am an Occupational Therapist who has worked mostly with children who are on the Autism Spectrum. What you are describing are traits that many children with PDD have. However, these traits alone do not mean your child is on the spectrum. The traits you describe are all related to Sensory Integration Dysfunction, which many children with Autism have, but can also stand alone. As one person mentioned, "The Out of Sync Child", is a good resource.
An Occupational Therapy Evaluation will be a good place to start to address these issues. You can ask your pediatrician for a refferral to Early Intervention, and if your child qualifies for services (according to test results), Early Intervention will supply services (or the local school system when he is school aged- over 3). The Occupatioanl Therapist will assist you to find ways to help him adapt to his environment to be able to function to his potential and participate in everyday routines without difficulty. The sooner you address these issues the better. At the same time, his quirks may just be a phase or just his way of coping with overstimulating situations, but if you are concerned, get him evaluated to put your mind at ease.