Final answer:
Jaundice in newborns typically peaks between the second and fourth day after birth. Phototherapy can be used to treat jaundice.
Step-by-step explanation:
Jaundice in newborns typically peaks between the second and fourth day after birth. This is known as physiological jaundice and is caused by the breakdown of red blood cells and the immaturity of the liver's ability to process bilirubin.
During this time, the level of bilirubin in the baby's blood may rise and result in a yellowish discoloration of the skin and eyes. Phototherapy, which involves exposing the baby's skin to special lights, is often used to help break down the excess bilirubin and treat jaundice.