show an inappropriate attachment to objects (such as always carrying around a statue or piece of string) or frequently put objects into his or her mouth?
engage in obsessive, repetitive behaviors such as opening and closing doors, turning light switches on and off, or lining up cars?
display ritualistic behaviors such as lining up books on the floor in a specific order at specific times?
engage in little or no spontaneous pretend play?
constantly play by him or herself, showing no interest in peers?
never bring or show you toys?
show no separation anxiety when you leave?
resist change and insist on sticking to specific routines or rituals?
engage in self-injurious behavior such as head banging or hand biting?
show no apparent fear of danger or pain?
not like to be hugged, cuddled, or touched?
have unanimated facial expressions and/or a monotone voice?
demonstrate extreme over- or underactivity?
display a lack of sensitivity or oversensitivity to sound, touch, or visual stimuli (such as loud noises, rough fabrics, or bright lights)?
have unusual sleep patterns (such as trouble falling asleep or not sleeping through the night)?
eat only limited, specific foods?
This is excerpted with permission from "The Autism Sourcebook : Everything You Need to Know About Diagnosis, Treatment, Coping, and Healing," by Karen Siff Exkorn. Published by Regan Books. Copyright © 2005.