I am having the exact prob as you! My baby gal was hospitalised and under phototherapy for 3 nights immediately after she was born. then another 2 more days under the phototherapy when she was 2 weeks old as jaundice rises to 20.7mg/dl (btw, level 153 is in what units?) Doc said she has breastmilk jaundice and so, the last 2 nights of phototherapy, we let her go fully on fm. indeed, when after 2 nights, the level dropped rapidly and she looked pink and fair!
We were told that we can resume bf. So, i continued bf but she slowly turned yellow again. It's heart wrenching to see her so yellow while other babies are pink and fair.
I read up on breast milk jaundice. why it was suggested to give fm is bcos it is thought that in breast milk jaundice babies, the breast milk contains some fatty acid which resulted in the absorption of bilirubin into the bloodstream and so, it cant be expelled out. but usu, once baby goes beyond week 2 of age, the jaundice level should not be so high that it is of danger, and will take some weeks for it to clear. If jaundice level still high, then, it could be some liver prob. my baby had a blood test to test for liver function and it was normal. so, it is clear that my gal's jaundice is due to my breast milk. it is really depressing cos i also ave more than enough milk for her and yet my milk is causing her this. i cry sometimes cos of this.
Anyway, i became concerned cos i thought she looked more yellow so going to see pediatrician again tomorrow and see how. will update again
oh yes, if jaundice level is above 20mg/dl, there is a risk of brain damage. so, doc are very concerned to quickly bring the level down and hence recommend supplement with fm.