Exposure to maternal gestational diabetes diagnosed by 26 weeks' gestation was linked to risk of autism spectrum disorders (ASDs) in their offspring, new research suggests. The retrospective study looked at more than 322,000 singleton children born in 1995–09 at Kaiser Permanente Southern California (KPSC) hospitals, tracking children from birth until the first clinical diagnosis of ASD, last date of continuous KPSC health plan membership, death, or December 31, 2012. In all, 3,388 children were diagnosed with an ASD, including 115 who were exposed to preexisting type 2 diabetes, 130 exposed to gestational diabetes at or before 26 weeks, and 180 exposed after 26 weeks. After adjusting for various factors, maternal preexisting type 2 diabetes was not significantly associated with risk of ASD in their children; however, gestational diabetes diagnosed at 26 weeks or earlier continued to be associated with the risk. The researchers note that exposure to antidiabetic medication was not independently associated with risk for ASD.