METHODS We performed a retrospective cohort study comparing attained growth in children with CHD to matched controls without CHD as well as published references. We used electronic medical record data from a large primary care network. The records included data from 33 practices in urban, suburban, and semirural locations in Pennsylvania, New Jersey, and Delaware. Practices in the network started using the electronicrecordbetweenAugust2001 and June 2006.