A new study published in the July 2006 edition of the American Journal of Obstetrics and Gynecology concludes that there is no benefit to delivering twins at thirty-seven or thirty-eight weeks gestation, yet there are dangers associated with posterm pregnancy after forty weeks. The results of a study of more than 60,000 twin births between 1995 and 1997 found that the babies born after forty weeks had lower APGAR scores and a higher rate of mortality. However, the study found no additional health benefits for babies delivered at thirty-seven or thirty-eight weeks, contrary to popular theory that often prompts doctors to induce twin birth prior to thirty-eight weeks' gestation.

• Parent's Poll: When did you deliver?
• Pregnancy FAQ: What's the typical gestation for a twin pregnancy?