Quoting Giggity-Giggity:" Thing is, they want to let me breast feed but they won't let him eat from the boob because they dunno ... [snip!] ... dunno how much he'll take. So im totally fine with him takening from the bottle, he just won't latch to the bottle nipple. "
They should be able to tell with how many wet diapers he starts having. But they probably will want you to continue doing what your doing until his jaundice is clear and he gets the ok to go home. At home you can just nurse nurse nurse, and then supplement if needed. Drink tons of water and your supply should come back. Nursing increases supply more than pumping so don't get discouraged yet! For this first week with my dd I had to feed her bm with a syringe because she just wouldn't stay awake to eat. She got it eventually! Always nurse first and then offer more afterwards, he won't eat if he's not hungry. Hope you get a chance to at least try nurse him. Good luck!