Newborn Jaundice is mostly PHYSIOLOGICAL,which means it's a normal condition...However in some cases it may rise beyond a certain level, wherein it is called PATHOLOGICAL JAUNDICE (which may require treatment by Phototherapy)...for detection of this, baby needs to be clinically examined by your Pediatrician....If he suspects the level of JAUNDICE to be higher, he will do a S.Bilirubin test.
Next Steps
For now, do regular breastfeeding every 2 hours and also on demand, and go for a follow up visit to your Pediatrician