In human reproduction, a live birth occurs when a fetus, whatever its gestational age, exits the maternal body and subsequently shows any sign of life, such as voluntary movement, heartbeat, or pulsation of the umbilical cord, for however brief a time and regardless of whether the umbilical cord or placenta are intact.
This definition of the term "live birth" was created by the World Health Organization in 1950 and is chiefly used for public health and statistical purposes. Whether the birth is vaginal or by Caesarean section, and whether the neonate is ultimately viable, is not relevant to this statistical definition. However, the term "live birth" was in common use long before 1950.
In the United States, the term "born alive" is defined by federal statute.
http://en.wikipedia.org/wiki/Live_birth_%28human%29
Childbirth, labour, delivery, birth, partus, or parturition is the culmination of a human pregnancy or gestation period with the expulsion of one or more newborn infants from a woman's uterus. The process of normal human childbirth is categorized in three stages of labour: the shortening and dilation of the cervix, descent and birth of the infant, and birth of the placenta.[1] In many cases, with increasing frequency, childbirth is achieved through caesarean section, the removal of the neonate through a surgical incision in the abdomen, rather than through vaginal birth.[2] In the U.S. and Canada it represents nearly 1 in 3 (31.8%) of all childbirths.[3] More than 22% of women undergo induction of labour and childbirth in the United States, doubling the rate in 2006 from 1990.[4] Medical professional policy makers find that induced births and elective cesarean can be harmful to the fetus and neonate as well as harmful or without benefit to the mother, and have established strict guidelines for non-medically indicated induced births and elective cesarean before 39 weeks.[5] There are, however a number of health conditions that may warrant inducing labour, some examples of when labour induction may be indicated include gestational or chronic hypertension, preeclampsia, eclampsia, diabetes, premature rupture of membranes, severe fetal growth restriction, and post-term pregnancy. Cesarean section too may be of benefit to both the mother and baby for certain indications including maternal HIV/AIDS, Foetal abnormality, breech position, foetal distress, multiple gestations, and maternal medical conditions which would be worsened by labour or vaginal birth.
Childbirth routinely occurs in hospitals in much of Western society. Before the 20th century and in some countries to the present day it has more typically occurred at home.[66]
In Western and other cultures, age is reckoned from the date of birth, and sometimes the birthday is celebrated annually. East Asian age reckoning starts newborns at "1", incrementing each Lunar New Year.
Some families view the placenta as a special part of birth, since it has been the child's life support for so many months.The placenta may be eaten by the newborn's family, ceremonially or otherwise (for nutrition; the great majority of animals in fact do this naturally).[67] Most recently there is a category of birth professionals available who will encapsulate placenta for use as placenta medicine by postpartum mothers.
The exact location in which childbirth takes place is an important factor in determining nationality, in particular for birth aboard aircraft and ships.
http://en.wikipedia.org/wiki/Childbirth
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