If the jaundice level is low then yes feeding and sunlight will be enough. The problem with the substance that causes jaundice, bilirubin, is once it gets a certain level, it starts to cause lethargy and with that, poor feeding. The poor feeding can cause dehydration which can then cause those levels to rise again. The danger with jaundice is if the bilirubin level gets very high it can cause a specific type of brain damage. But don't worry these days it's very very rare and jaundice will be noticed before it gets to this level. As to the numbers required for phototherapy, there are no hard and fast numbers. It depends on the gestation of the baby, weight, age in hours, and pediatrician opinion.. It might be worth if your bub needs phototherapy, to ask if it can be done in your room.