A 7-day-old baby weighing 2.7 kg, full-term serum bilirubin on day 5 was 13.5 direct 2., recount 9, blood group A+, mother O+. CBC WNL. CRP- positive. Accepting feed normally maintaining weight on breastfeeding.
His serum bilirubin on day 7 is still 13 direct 2. despite being on phototherapy. How to manage this case?