Importance Few studies have examined the curtailment of reproduction (ie, stoppage) after the diagnosis of a child with autism spectrum disorder (ASD). Objective To examine stoppage in a large, population-based cohort of families in which a child has received a diagnosis of ASD. Design, Setting, and Participants Individuals with ASD born from January 1, 1990, through December 31, 2003, were identified in the California Department of Developmental Services records, which were then linked to state birth certificates to identify full sibs and half-sibs and to obtain information on birth order and demographics

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