Neonatal jaundice is the most common phenomenon in newborns. Generally, if it is physiological jaundice, for full-term infants, which are babies born after a full 37 weeks, the jaundice should resolve within two weeks. For preterm babies, those born before 37 weeks, the duration may be slightly longer, possibly lasting three to four weeks, but generally, it should clear up by four weeks. If it extends beyond these durations, like more than two weeks in full-term infants or more than four weeks in preterm infants, this is considered excessively prolonged jaundice. In such cases, a visit to the hospital is necessary. Doctors need to perform relevant checks to assess the severity of the jaundice and determine if there are any pathological factors involved. If pathological factors are present, timely intervention and treatment are required.