What are Non-Verbal Symptoms in Children?

Children with autism spectrum disorders have trouble picking up on subtle nonverbal cues and using body language. This makes the "give-and-take" of social interaction very difficult. Here are signs that a child may have autism: 

They avoid eye contact and use facial expressions that don't match what he or she is saying The child doesn't pick up on other people's facial expressions, tone of voice, and gestures. They make make very few gestures, such as pointing to things. They may lack empathy and seem insensitive to others needs. They react unusually to sights, smells, textures, and sounds, and may be especially sensitive to loud noises. Abnormal posture, clumsiness, or eccentric ways of moving , such as walking exclusively on tiptoe.