Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Mulibrey Nanism ?
    ### Response:
    What are the signs and symptoms of Mulibrey Nanism? Mulibrey nanism (MN) is characterized by progressive growth failure that begins prenatally (before birth). Hypotonia (poor muscle tone) is common. Newborns often have characteristic abnormalities of the head and face, including a triangularly shaped face.
    