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特許 権利維持 Childbirth, labour, delivery, birth, partus, or parturition is the culmination of a period of pregnancy with the expulsion of one or more newborn infants from a woman's uterus. The process of normal childbirth is categorized in three stages of labour: the shortening and dilation of the cervix, descent and birth of the infant, and the placenta being expelled.
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