It interferes with the development of the brain in areas which control verbal and nonverbal communication, social interaction, and sensory development.
Autism is a spectrum disorder.
This means the symptoms and characteristics of the disorder range from mild to severe and vary in intensity. Individuals with autism may have repeated body movements, unusual interactions with people, attachment to objects, and resist change to routines. The age of the mother during pregnancy. Birth order of the child. Bleeding during pregnancy.