The most important medical aspect of Down syndrome is [[mental retardation]]. Individuals with Down syndrome have mild to severe mental retardation. It is impossible to reliably predict what the eventual level of function of a child with Down syndrome will be. | The most important medical aspect of Down syndrome is [[mental retardation]]. Individuals with Down syndrome have mild to severe mental retardation. It is impossible to reliably predict what the eventual level of function of a child with Down syndrome will be. |