At one time autism was not known, until Leo Kanner described it. Just because the DSM has not caught up with the research that does not make it less real. I disagree that there are no criteria. Unfortunately there is no test like for strep throat and we have to rely on the reporting of parents and teachers.
One difficult question is "Where is the cut off point. We all have sensory peculiarities, but when does it become a disorder?"
A 5 year old boy is always touching the girls hair in his kindergarten class,he twirls,rubs,and spells their hair even after being told it's inappropriate
2 yr old girl having bowel issues…stool gets backed Up. Been in hospital to get cleared out. On MiraLAX daily but still constipated. X-ray does not show