1 Jennifer W. Kaminski, Ruth Perou, Susanna N. Visser, D. Camille Smith, and Melissa L. Danielson are with National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, GA. Keith G. Scott is with the Linda Ray Intervention Center, University of Miami, Miami, FL. Leila Beckwith and Judy Howard are with the Department of Pediatrics, University of California at Los Angeles.