Both my son's have had it 2nd worse than the first. Feed often and 10-15 min in the window or outside a few times a day. Both are fine 2nd son had to use a bili blanket. 36+1 now and Dr said anytime now because she is so far down already and I worry she will have it but know it will be OK.
Just keep in mind it is very common also not direc t sun
For Jaundice the way you can help is by allowing your baby getting some sun light. Usually treatments for babies with jaundice and how severe it is they normally would put them under the light and that helps with billirubin breakdown. They are measuring for numbers to see how severe their jaundice is, if it's under certain numbers it probably doesn't require much treatment other than exposing baby to some sun light.