Final answer:
Physiologic jaundice is a common condition in newborns that becomes visible between the second and fourth days of life when bilirubin levels peak.
Step-by-step explanation:
Physiologic jaundice is a common condition in newborns that occurs when the concentration of bilirubin in the blood is high. It usually becomes visible between the second and fourth days of life when serum bilirubin levels peak. Physiologic jaundice is not caused by blood incompatibilities between the mother and infant blood types, and it is not limited to the first 24 hours of life. Breast milk jaundice is a separate condition and is not the same as physiologic jaundice.