Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Congenital Heart Defects ?
    ### Response:
    Many congenital heart defects cause few or no signs and symptoms. A doctor may not even detect signs of a heart defect during a physical exam.
                
Some heart defects do cause signs and symptoms. They depend on the number, type, and severity of the defects.
    