Jaundice check

all of my sons had prolonged jaundice before (>30 days). Usually, for the 1st two weeks straight, they check the bilirubin level everyday. if it's still high, they will withdraw some blood to check for the thyroid function and LFT (liver function test), also some urine samples. After that, we need to check for the bilirubin levels every 2 days until the levels within the normal range (