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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.
Twins are usually born earlier than singleton babies and in fact, are considered to be 'at term', or fully ready for birth at 37 weeks, as opposed to 40 weeks for singletons. About half of twin pregnancies make it to term, the other half are born prematurely to some degree.