I wonder how many babies surviving early birth add to the numbers. 20 years ago babies born at 25 weeks gestation weren't likely to survive at all, now many survive but after months in an incubator being jabbed, poked, exposed to bright lights 24 hours a day.
I don't know...I don't think you would find an abnormally high incidence of preemie babies in the pool of autistic children. I'm just basing this on the 100 or so autistic children I have known. I don't think it would add much to the trends.