How long the jaundice of infants can subside should be judged according to the condition of the infants. Generally speaking, jaundice of full-term infants will completely subside within 2 weeks, and that of preterm infants will subside within 4 weeks, and if it is longer than this time, it may be pathologic jaundice.
Jaundice appears 2 to 3 days after birth in full-term infants, peaks in 4 to 5 days, subsides in 5 to 7 days, and does not exceed 2 weeks at the latest; in preterm infants, jaundice mostly appears 3 to 5 days after birth, peaks in 5 to 7 days, subsides in 7 to 9 days, and is delayed for 3 to 4 weeks at the longest.
If jaundice persists for >2 weeks in full-term infants and >4 weeks in preterm infants, it is necessary to consider pathological jaundice and breast milk jaundice, and it is recommended to go to the hospital for further abdominal ultrasound to find out if there is any gallbladder atresia or bile viscosity in the liver, gallbladder and spleen.