- Poor or no Language: Starts talking later than other children. Failure to express or understand language. No gestures or pointing. Stops saying words once said. Repeats words you say. Acts like he or she doesn't hear what you say. Does not make eye contact when making requests. Speaks with an abnormal tone or rhythm — may use a singsong voice or robot-like speech
- Poor Social Skills: No eye contact or inconsistent eye content. Avoidance of people especially other children. Likes to play alone. Doesn't cuddle or hug. Doesn't respond to his or her name. Appears not to hear you at time. Appears unaware of others' feelings. Retreats into his or her "own world"
- Unusual or Repetitive Behavior: Performs repetitive activities such as rocking body, spinning around, flapping hands, hitting self, hitting head against wall or floor. Lines up toys or objects and gets upset if someone changes the arrangement. Unusual interest in parts of toys or objects (for example spins wheels on vehicles). Develops specific routines or rituals. Becomes upset at the slightest change in routines or rituals. Moves constantly. May be fascinated by parts of an object, such as the spinning wheels of a toy car. Shows unusual sensitivity to light, sound or touch but is oblivious to pain.