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fetus | definition: an unborn or unhatched vertebrate in the later stages of development showing the main recognizable features of the mature animal | synonyms: monster, teras, vertebrate, ductus arteriosus, foetus, umbilical, abortus, umbilical cord, baby, craniate
In human development, a fetus (/ËfiËtÉs/ ; plural fetuses), also spelled foetus, is a prenatal human between its embryonic state and its birth. The fetal stage of development tends to be taken as beginning at the gestational age of eleven weeks, i.e. nine weeks after fertilization.ccording to data from 2003â05, survival rates are 20 to 35 percent for babies born at 23 weeks of gestation; 50 to 70 percent at 24 to 25 weeks; and over 90 percent at 26 to 27 weeks. It is rare for a baby weighing less than 500 gm to survive.