Review Question - QID 210902

A 64-hour-old baby girl is being evaluated for discharge. She was born by forceps-assisted vaginal delivery at 39 weeks gestation. The mother has no chronic medical conditions and attended all her prenatal visits. The mother’s blood type is A+. On day 1, the patient was noted to have a scalp laceration. Breastfeeding was difficult at first but quickly improved upon nurse assistance. The patient has had adequate wet diapers since birth. Her temperature is 98.7°F (37°C), blood pressure is 85/52 mmHg, pulse is 132/min, respirations are 48/min, and oxygen saturation is 99% on room air. Upon physical examination, the resident notes the infant has scleral icterus and jaundiced skin. The scalp laceration noted on day 1 is intact without fluctuance or surrounding erythema. When the infant is slightly lifted from the bed and released, she spreads out her arms, pulls them in, and exhibits a strong cry. Labs are drawn as shown below:

Blood type: AB-
Total bilirubin 8.7 mg/dL
Direct bilirubin 0.5 mg/dL

6 hours later, repeat total bilirubin is 8.3 mg/dL. Which of the following is the most appropriate next step in the management of the baby’s condition?