"Bilirubin levels" refers to the amount of a yellow-colored compound called bilirubin in the blood. It is a measure of how well the liver is functioning, as high levels may indicate liver or bile duct problems. Full definition
It is one of the side effects of high bilirubin levels in newborns. (newbornbabyzone.com)
Another one of the side effects of high bilirubin levels in newborns is sleepiness. (newbornbabyzone.com)
The problem with jaundice is that if you let bilirubin levels get too high without managing them, the baby can get severe, irreversible brain damage from a condition known as kernicterus. (crunchydomesticgoddess.com)