Because a neonate's liver does not work effectively at first, almost half of all newborns develop a yellowish tinge to their bodies and eyes called

Neonatal jaundice affects almost half of all newborns and they develop a yellowish tinge to their bodies because a neonate’s liver doesn’t work properly at first.

It occurs when a baby has a huge level of bilirubin in the blood. Bilirubin is a yellow substance that the body makes when it changes old red blood cells.