Overall, this observational cohort study aims too: 1. Implement rapid trio WGS for all children presenting to our health systems with epilepsy onset under 12 months of age. 2. Utilize electronic healthcare records and research databases to unite phenotypic and genomic data and to create a virtual registry across all institutions that will promote ongoing discovery. 3. Assess the impact of early genetic diagnosis on epilepsy, developmental, and health economic outcomes through formal longitudinal assessments of all children enrolled.