Developmental disabilities are a group of conditions due to an impairment in physical, learning, language, or behavior areas. About one in six children in the U.S. have one or more developmental disabilities or other developmental delays.
Children reach milestones in how they play, learn, speak, behave, and move. CDC has checklists to help parents and others track a child’s development.
- Page last reviewed: April 27, 2015
- Page last updated: April 27, 2015
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