Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Trisomy 18 ?
    ### Response:
    What are the signs and symptoms of Trisomy 18? The Human Phenotype Ontology provides the following list of signs and symptoms for Trisomy 18. If the information is available, the table below includes how often the symptom is seen in people with this condition.
    