Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) achondrogenesis ?
    ### Response:
    Achondrogenesis is a group of severe disorders that affect cartilage and bone development. These conditions are characterized by a small body, short limbs, and other skeletal abnormalities. As a result of serious health problems, infants with achondrogenesis usually die before birth, are stillborn, or die soon after birth from respiratory failure.
    