Abstract: The delayed interval delivery of the twin (DIDT) refers to the extension of the delivery interval of the second fetus (F2) through conservative treatment after miscarriage or premature delivery of the first fetus (F1) in a twin pregnancy. We report three cases of DIDT from our hospital. The delivery interval of F2 was extended to varying degrees by the comprehensive treatment with anti-inflammatory, tocolytic and lung maturation promoting agents after the delivery of F1. The appropriate treatment of the delayed delivery of F2 can significantly improve the perinatal outcome of F2, which is an important measure for the F1 miscarriage or preterm delivery of twin pregnancy. For the risk of many complications in the delayed delivery of F2, both mother and relatives should be fully communicated. After weighting the advantages and disadvantages, the delayed delivery of F2 can be tried in those hospitals with the ability to treat newborns, in which the DIDT indications should be strictly mastered, the infectious index closely monitored, the complications timely found, and the termination of pregnancy be asked duly.

Key words: Pregnancy, twin；, Premature birth；, Obstetric labor, premature；, Delayed interval delivery of the twin；, Case reports