Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Developmental Disabilities ?
    ### Response:
    Developmental disabilities are severe, long-term problems. They may be physical, such as blindness. They may affect mental ability, such as learning disorders. Or the problem can be both physical and mental, such as Down syndrome. The problems are usually life-long, and can affect everyday living.
    