The problem with that paradigm is clinicians rely on speech and behavior from ages 1-3, looking for abnormalities. Hard to assess issues before 12 months, most

The problem with that paradigm is clinicians rely on speech and behavior from ages 1-3, looking for abnormalities. Hard to assess issues before 12 months, most kids don't speak much until after then. Its prevalence is estimated at 1 in 54, by the way. I doubt researchers and experts are off by a factor of 50.