reporter: it is noon in the neo-natal intensive care unit, at east tennessee children s hospital. and baby grayson, just 48 hours old, is shaking again. he s tremoring. reporter: grayson was born with a serious drug dependency because his pregnant mother was addicted to painkillers. now he gets morphine every three hours to cut the pain of withdrawal. grayson was brought here from a nearby hospital to this special unit for detoxing newborns. right now there are 23 tiny patients here going through withdrawal mostly from prescription pills like oxycontin, vicodin or percocet. good morning. reporter: carla saunders is the head nurse of this special unit. they will have really bad tremors, really bad jitters, very bad irritability, vomiting, diarrhea, cramping. reporter: ashton, just 19 years old, is grayson s mom. he has done so good today.