Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Biliary Atresia ?
    ### Response:
    No single test can definitively diagnose biliary atresia, so a series of tests is needed. All infants who still have jaundice 2 to 3 weeks after birth, or who have gray or white stools after 2 weeks of birth, should be checked for liver damage.2
                

    