Jaundice ?😐

Kyleigh • It's a boy!🌱🍼🐻 Born: 2•17•16
My baby boy is just 5 days old and he has a little jaundice. I upped my Vitamin D supplements since I'm breastfeeding, and let him soak up some sun for 5mins at a time daily (if these Portland clouds permit). But he's just yellowing and I don't know how long it lasts or how to aid it. Help?