types of intellectual and developmental disabilities
Intellectual and Developmental Disabilities (IDDs): Overview. Intellectual and developmental disabilities (IDDs) are a primary focus of the NICHDâs research support. IDDs include a variety of different types of disabilities and disorders, including those that affect the nervous system, metabolism, and cell function and survival. The NICHD supports and conducts research to understand the causes and effects of IDDs and to help identify effective therapies for these disorders.