| Parent/caregiver concerns |
- Deficits in social skills.
- Deficits in language skills or behavior.
- Frequent, prolonged tantrums (often with unclear triggers).
- Intolerance to changes in routines or transitions.
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| Impaired social communication and interaction |
- Developmental regression or loss of skills (eg, stop saying words they were once using).
- Delayed or unusual (eg, repetitive or not social) language skills.
- Wanting to be alone or lack of joint attention (eg, avoiding eye contact, not looking at objects when others point at them).
- Lack of orientation to name by age 9 months.
- Does not engage in interactive games or reduced use of gestures by age 12 months (eg, peek-a-boo or patty cake, waving goodbye).
- Lack of shared interest by 15 months (eg, by showing an object that they like).
- Lack of pointing to indicate interest by age 18 months (eg, by pointing to an airplane flying over).
- Having trouble relating to others by age 24 months (eg, noticing if someone is hurt).
- Lack of interest in others by age 36 months (eg, does not join other children in play or is content to play alone for long periods).
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| Repetitive behaviors/restricted interests and atypical sensory reactions* |
- Repetitive patterns of behavior and speech (eg, lining, stacking, or grouping items; echoing words [echolalia] or scripting).
- Overly intense interest in certain objects or toys or parts of objects.
- Becoming upset by minor changes in routine or transitions.
- Repetitive body movements including but not limited to flapping hands, rocking body, or spinning in circles.
- Seeking sensory input or having unusual reactions to sensory experiences (eg, how things sound, smell, taste, look, or feel).
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