UGT1A1 and Jaundice: Many studies have reported the effects of genetic polymorphisms in UGT1A1 on neonatal jaundice, including breast milk jaundice and preterm jaundice, with UGT1A1 TATA-box polymorphism (96), UGT1A1*6 (97–100), and UGT1A1*28 (101) as the reported jaundice enhancers.