Summary of the (A) data collection timeline and (B–D) three-part analytic plan. Functional connectivity magnetic resonance imaging (fcMRI) data were collected at 6 months, continuous measures of autism spectrum disorder (ASD)–associated behavior were collected at 12 and 24 months, and ASD diagnostic outcomes were evaluated at 24 months. Circles and squares represent regions of interest (ROIs) located in the cortex and cerebellum, respectively. Colors (green, pink, blue, yellow) denote ROI network (Net) assignments (Net 1 and Net 2 being arbitrary non–frontoparietal network [FPN] and non–default mode network [DMN], respectively). bx, behavior; Fc, functional connections/functional connectivity.