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In page Beginning of human personhood:

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In some countries, early abortions are legal in all circumstances but late-term abortions are limited to circumstances in which there is a clear medical need.[citation needed] There is no sharp limit of development, gestational age, or weight at which a human fetus automatically becomes viable.[4] A 2013 study said: "While only a small proportion of births occur before 24 completed weeks of gestation (about 1 per 1000), survival is rare and most of them are either fetal deaths or live births followed by a neonatal death".[5]