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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 two offspring produced by the same pregnancy. Twins can be either monozygotic (identical), meaning that they develop from one zygote, which splits and forms two embryos, or dizygotic (fraternal), meaning that they develop from two different eggs. In fraternal twins, each twin is fertilized by its own sperm cell. In contrast, a fetus that develops alone in the womb is called a singleton, and the general term for one offspring of a multiple birth is multiple. Non-related look-alikes whose resemblance parallels that of twins are referred to as doppelgangers.