Key PointsQuestionIs there an association between general movement assessment results and neurodevelopment in infants with vertical Zika virus exposure?FindingsIn this cohort study of 444 children, including 111 prenatally exposed to acute maternal illness with rash during the Zika epidemic, general movement assessment was associated with neurodevelopment at age 12 months (94% negative predictive value, 78% positive predictive value, 70% sensitivity, 96% specificity, and 91% accuracy). The Motor Optimality Score was 23 in children with normal development, 12 in children with adverse outcomes, and 5 in children with microcephaly, a significant difference.MeaningGeneral movement assessment is a helpful tool in the evaluation of neurodevelopment in Zika virus–exposed children.