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Twins Come Early. Another difference between a twin pregnancy and a singleton pregnancy is that the babies tend to arrive very early. Full term for a singleton pregnancy is 40 weeks. If you carry twins to 40 weeks, bless you. It is not an easy task. Most twins never make it that far. Most twins arrive around 36 weeks.
The optimal length of gestation appears to be shorter in twin than in singleton pregnancies. Epidemiological evidence suggests that the lowest rate of perinatal mortality (PNM) occurs at 37 to 39 weeks in twin pregnancies versus 39 to 41 weeks in singleton pregnancies [3-7].