- Difficulty in using and understanding language. Some children develop typical speech patterns until age two.
- Poorly developed social skills and unusual play with toys.
- Over or under sensitivity to sound, sight, taste, touch, or smell.
- Repetitive behaviors such as spinning objects or rocking.
- Certain behaviors exhibited to stimulate the senses, such as switching a light on and off repeatedly, or humming loudly.
- Difficulty with changes to surroundings or routines.
- Very high levels of activity for long periods of time.
- Uneven skill development. Some skills are normal or superior for their age while others show significant delay.
- Challenging behaviors such as aggression, self injury or severe withdrawal.
Source: Center for Autism & Related Disabilities (CARD)