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Like twins, quintuplets may be identical (from the same egg) or fraternal (from different eggs released from the ovary at the same time). Identical siblings have the same DNA, while fraternal siblings are no more alike than siblings born from different pregnancies. Quintuplets are rare because multiple births in human beings are much less frequent than singleton births. Furthermore, the human uterus is not designed to carry multiple births: the load of five babies rarely goes to term, thus resulting in five very small babies subjected to the risks of prematurity.

Most quintuplet births nowadays are due to fertility enhancing drugs. The Dionnes and Diligentis are among the very few to have been conceived naturally and to have survived beyond infancy.

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12y ago

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