The best current estimates are that autism occurs in 40 to 67 children per 10,000 live births. This means that the prevalence of autism has increased 1,000 percent in the last decade. According to the latest figures just released in January 2003 by the California Department of Developmental Services, California experienced an astounding 31 percent increase in the number of new children… | The best current estimates are that autism occurs in 40 to 67 children per 10,000 live births. This means that the prevalence of autism has increased 1,000 percent in the last decade. According to the latest figures just released in January 2003 by the California Department of Developmental Services, California experienced an astounding 31 percent increase in the number of new children… |