Phototherapy
Phototherapy is treatment with a special type of light (not sunlight). It's sometimes used to treat newborn jaundice by making it easier for your baby's liver to break down and remove the bilirubin from your baby's blood. Phototherapy aims to expose your baby's skin to as much light as possible.
In some cases, phototherapy will only be needed for 24 hours or less, in some cases, it may be required for 5 to 7 days. The AAP Guidelines suggest that an infant readmitted for hyperbilirubinemia, with a level of 18 mg/dL or more, should have a level of 13 - 14 mg/dL in order to discontinue phototherapy.
Phototherapy should be instituted when the total serum bilirubin level is at or above 15 mg per dL (257 mol per L) in infants 25 to 48 hours old, 18 mg per dL (308 mol per L) in infants 49 to 72 hours old, and 20 mg per dL (342 mol per L) in infants older than 72 hours.