Final answer:
Bilirubin should not be exposed to light because it can form toxic byproducts. Light exposure can help break down bilirubin and prevent brain damage in newborns. Phototherapy is used to treat high levels of bilirubin in newborns.
Step-by-step explanation:
Bilirubin should not be exposed to light because it can be easily broken down by light, resulting in the formation of toxic byproducts. This is especially important for newborns who have high levels of bilirubin, as exposure to light helps to break down the bilirubin quickly and prevent the risk of brain damage. Phototherapy, which involves exposing the baby to UV light, is commonly used to treat newborns with high levels of bilirubin.