NCIt definition : Jaundice that appears during the neonatal period. In the majority of cases, it appears
in the first week of life and is classified as physiologic due to accelerated destruction
of erythrocytes and liver immaturity. In a minority of cases it is classified as non-physiologic,
appearing in the first twenty four hours after birth, and is associated with underlying
diseases including hemolytic disorders, polycythemia, and cephalohematoma.;
Alternative definition : NICHD: Yellow coloring of skin, mucous membranes and eyes due to hyperbilirubinemia
that appears during the first 28 days of life.;