Preservative or repetetive behaviors
Decreased interest in social situations by age 24 months
Loss of skills previously mastered
Decreased eye contact
Lack of imitation skills
Decreased/lack of appropriate play skills
Absent pointing by one year of age
Difficulty with transitions
Limited sound repertoire
Leaving off first sound of a word
Inconsistent sound errors
Randomly says a word accurately, then doesn't use it again
No words produced consistently by 16 months
Delayed response time
Increased need for repetition for response to commands, questions