mentally retarded
retarded
developmentally challenged

So I couldn't really use any developmentally challenged people as models, and as a result, she at first seemed totally normal.

Many developmentally challenged individuals never reach this stage regardless of age.

The Centre provides education and training for developmentally challenged students.

This discipline provided a structure for working with developmentally challenged children and adults.

This article states the importance of establishing question asking strategies with developmentally challenged children.

Developmentally challenged adults also have had a dance on Friday nights since the late 1970s.

There is also a preschool program available for developmentally challenged children.

Special categories for developmentally challenged students have been introduced recently to the fair.

"New Jersey is really backward when it comes to dealing with the developmentally challenged," she said.

The book very movingly tells her story and that of her developmentally challenged daughter.