What is the longest period between the births of twins in a "Delayed Interval Delivery" case?

The longest known intertwin delivery interval with cerclage (suturing the cervical opening) is 153 days.

A case report of delayed delivery of 99 days in a triplet pregnancy was also presented. A triplet pregnancy in a single uterus resulted from Pergonal stimulation of ovulation. At 23.5 weeks' gestation, the first triplet delivered after spontaneous rupture of membranes. Ninety-nine days later, the remaining two fetuses were delivered, the second one stillborn after intrauterine death at 37 weeks of gestation, and the third fetus a normal viable female consistent with 37.5 weeks' gestation. This is the longest interval of delayed delivery discovered from a literature review, and the only such instance of triplet pregnancy in a single uterus.

Reference Links:

http://72.14.207.104/search?q=cache:tScCFNBigDAJ:www.banner-trader.com/tutorials/Successful_obstetrical_management_of_110-day_intertwin_delivery_interval_without_cerclage:_counseling_and_conservative_management_approach_to_extreme__24039_BMC-Pregnancy-and-Childbirth_article.html+longest+Delayed+interval+delivery+without+cerclage&hl=en

http://www.greenjournal.org/cgi/content/abstract/64/3/8s

And quintuplets(documented in Poland) of which only the fourth survived after 61 days.
- Report
by Alatea on November 15th, 2005

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