Another doctor's appointment

We went to doctor again on Wednesday. We weighed Ashley and she is at 8lbs 11 oz. She is a growing girl! It's typical to gain an ounce a day, but she likes to gain more like 2 a day. She gained 11 oz since her last weigh in. Dr. said she was doing good in that department. He went ahead and ordered another test of her billirubin levels. He said she looked a lot better than last week, but her shoulders, head, and eyes are still pretty yellow. The results came back at 13.2 (down from 13.4 the previous week). Dr. wants to see her again in a week and check again. I'm thinking this should be over by now, I hope it's nothing to be concerned over. I have yet to determine what level is average/acceptable for a 2 1/2 week old baby.