Heffler KF, Sienko DM, Subedi K, et al. - This investigation draws on data from the National Children’s Study, a US multicenter epidemiological study of environmental influences on child health and development, to determine the correlation of experiential factors, including social activities and screen viewing in the first 18 months of life, perinatal factors, and demographic factors, with autism spectrum disorder (ASD)-like symptoms and risk on the Modified Checklist for Autism in Toddlers (M-CHAT) at 2 years. In total, 2,152 children (1,099 boys [51.1%]) were recruited at birth from October 1, 2010, to October 31, 2012. According to results, television and/or video viewing (yes or no) at 12 months of age was significantly linked to greater ASD-like symptoms at 2 years of age but not with ASD risk. Likewise, parent-child play daily compared with less than daily was significantly related to fewer ASD-like symptoms at 2 years of age but not with ASD risk. High screen viewing at 18 months of age, however, was not significantly linked to ASD-like symptoms or ASD risk by M-CHAT at 2 years of age. The authors found greater screen exposure and less caregiver-child play early in life to be related to later ASD-like symptoms.