Effect of Probiotic Lacobacillus Reuterii on Serum Bilirubin Levels in Preterm Infants

The goal of this clinical trial is to learn about the effect of probiotic Lactobacillus reuterii on the level of serum bilirubin in moderately and late preterm infants with birth weights 1000 grams to 2499 grams who were admitted to the NICU at Dr. Wahidin Sudirohusodo Hospital, Hasanuddin University Hospital and Cahaya Medika Hospital. The main questions it aims to answer are: * Are bilirubin levels in preterm infants who received probiotics were lower than those who did not receive probiotics? * Is the incidence of hyperbilirubinemia requiring phototherapy in preterm infants who received probiotics less than those who did not receive probiotics?