The Autism and Developmental Disabilities Monitoring (ADDM) Network will be the data source for this measure. ADDM provides reliable, population-based prevalence estimates of the number of school-aged children with cerebral palsy and other developmental disabilities over time and is the only program in the US conducting active surveillance for serious developmental disabilities using data on individual children. For the majority of children with cerebral palsy the cause of their cerebral palsy is unknown. The effects of improved neonatal care overtime which differ dramatically by birth weight have had particular implications for CP. This indicator focuses on one of the leading risk factors for cerebral palsy. Monitoring potentially modifiable, major risk factors is an area ripe for introducing interventions and improving outcomes.