Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Spastic diplegia cerebral palsy ?
    ### Response:
    What causes spastic diplegia cerebral palsy? Spastic diplegia cerebral palsy occurs when the portion of the brain that controls movement is damaged or develops abnormally. This usually occurs before birth, but can happen at any time while the brain is still developing (usually before age 2).
    