Hello My sisters new born baby s bilirubin was 12.8 which was checked post 48 hours of delivery, she was kept under phototherapy for 16hrs straight and her blood was checked for bilirubin which came 12.1.As per Doctors advice,phototherapy was continued for another 19 hrs .Post therapy birubin was 11. The pediatrician told that in some babies,the process of bilirubin elimination is slowly ,which is the same for her also.she is on breastfeed also. Kindly explain the reason.