Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) infantile neuroaxonal dystrophy ?
    ### Response:
    Infantile neuroaxonal dystrophy is a disorder that primarily affects the nervous system. Individuals with infantile neuroaxonal dystrophy typically do not have any symptoms at birth, but between the ages of about 6 and 18 months they begin to experience delays in acquiring new motor and intellectual skills, such as crawling or beginning to speak.
    