Bilirubin levels decrease at varying rates depending on the treatment and individual factors.
With intensive phototherapy, the total serum bilirubin level should decline by 1 to 2 mg per dL (17 to 34 μ mol per L) within four to six hours. However, the decrease can be slower in breastfed infants, around 2 to 3 mg per dL per day, compared to formula-fed infants.
