Methods: We collected records for all healthy neonates with a gestational age 35 weeks and
birth body weight (BBW) above 2500 g, born between March 2002 and July 2005, from our
nursery. A total of 1979 neonates were reviewed, 874 of whom were exclusively breastfed
and subsequently enrolled in this study. Only infants who were breastfed exclusively were
enrolled; 219 of these infants (25.1%) presented significant hyperbilirubinemia after 72 hours
of age. Infants with early-onset (