A 5-day-old term newborn is seen in a rural health centre with jaundice extending to the legs. He is breastfed and otherwise well. Transcutaneous bilirubin is high, and total serum bilirubin is 330 µmol/L at 120 hours of age without risk factors. According to updated Canadian Paediatric Society hyperbilirubinaemia guidance, what is the most appropriate management?