Dictionary of Human Evolution and Biology

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Third Trimester

Third of the three trimesters of human gestation, consisting of months 7-9, which includes the latter half of the fetal period, and during which differentiation continues to diminish in importance relative to growth of the fetus. By the middle of the third trimester a fetus could survive independently if born prematurely (weeks 26-38); the trimester ends upon parturition.

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