Is there an underlying medical cause for the jaundice? Although fields aren’t meant for newborns, you might want to use fields to address that medical cause.
If the baby’s doctor (rather than Dr. Google) has determined that there’s no underlying cause and that is more a standard case of infantile jaundice, which is conventionally treated with phototherapy, you might want to gently try fields like New Release - Photosynthesis, New Release - Full Spectrum Light and the Sun Gazer.
Again, fields aren’t meant to be used on newborns. This newborn seems to have a series of issues. Reiki is gentle enough for newborns, so maybe a gentle use of a Reiki field will help this little one.