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Yellow in babies, which is also called icterus neonatorum in medical language. The term ictrus comes from the Greek "icterus". Jaundice is also called jaundice, which means "jaune" comes from the French which means yellow. Which shows a yellow discoloration of the skin, sclera and mucous membranes resulting from increased plasma bilirubin levels. Purpose: to find out the description of bilirubin before and after phototherapy in newborns at Delia Langkat Hospital in 2022. Methods: The study used analytical methods to determine the relationship between variables with a cross-sectional design. The results showed that of the 4 samples of infants who were given phototherapy, the mean reduction in bilirubin levels was 2.5 ± 0.8 mg/dL. If percentaged, the average decrease in bilirubin levels is 16.3 mg/dL). Conclusion: The description of bilirubin in newborns at Delia Hospital before phototherapy did not show good results (16.43 ± 4.64 mg/dL) and after phototherapy showed good results (7.62 ± 3.68 mg/dL).