Inclusion Criteria:  Low birth weight infants (1800-2499 g) with oral feeding Exclusively breastfed or predominantly breastfed (consuming term infant formula less than 50 ml/Kg BW/day) at discharge Discharge from the hospital before 2 weeks of age and maximal age of enrolment is 14 days old Live in greater Jakarta Parents agree in writing to study participation and indicate their intention to follow study procedures.  Exclusion Criteria:  Any subject who has major congenital anomaly or any other disorder(s) that infers with normal feeding, growth, and neurodevelopment.  Participating in another intervention trial