Jaundice

Reece
My son was born on 11/22/16, via c-section at 38+3 weeks. We just found out today that he has jaundice and is on the lights and supplementing with formula until my milk comes in. His level went from 9.2 to 12.3. They said if it doesn't come down then he'll have to go upstairs to the neonatal unit. 
I'm worried 😩. Anyone have any experience with this? Outcomes?