"Pervasive Developmental Disorders (PDDs)" Pervasive Development Disorder PDD pervasive developmental disorders Pre-Development Disorder Pervasive Developmental Disorders For information WebMD Pervasive Development Disorders (PDDs) http://www.webmd.com/brain/autism/development-disorder Pervasive Developmental Disorders Pervasive Developmental Disorder Pervasive Developmental Disorders , http://www.webmd.com/brain/autism/development-disorder Pervasive Development Disorders: What Are They? - WebMD PDD Overview- Pervasive Development Disorders: What Are They? - WebMD Pervasive Development Disorders: What Are They? - WebMD Definition of PDD "Pervasive Developmental Disorders (PDDs)" "Pervasive Developmental Disorders (PDDs)"