Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Amish lethal microcephaly ?
    ### Response:
    Amish lethal microcephaly is a disorder in which infants are born with a very small head and underdeveloped brain.  Infants with Amish lethal microcephaly have a sloping forehead and an extremely small head size. They may also have an unusually small lower jaw and chin (micrognathia) and an enlarged liver (hepatomegaly).
    