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Encyclopedia > Gestation

Gestation is the carrying of an embryo or fetus inside a female viviparous animal. Mammals during pregnancy can have one or more gestations at the same time (multiple gestations). According to the National Center for Health and Statistics there were over 136,000 multiple human births documented in the United States in 2003(NCHS). [1] The time interval of a gestation is called gestation period, and the length of time the offspring have spent developing in the uterus is called gestational age. For other uses, see Embryo (disambiguation). ... “Unborn child” redirects here. ... Look up Female in Wiktionary, the free dictionary. ... A viviparous animal is an animal employing vivipary, a method of reproduction in which the embryo develops inside the body of the mother from which it gains nourishment, and not from an egg. ... For other uses, see Animal (disambiguation). ... This article needs to be cleaned up to conform to a higher standard of quality. ... Gestational age is age of a fetus (or newborn infant) from presumed conception. ...

Contents

Humans

Main article: Pregnancy

Human pregnancy can be divided into three trimesters, each three months long. The third trimester begins at about 28 weeks. The 23rd week is the first week when a preterm fetus is considered viable. Before this age major developmental events that would allow the fetus to survive outside the womb have not yet occurred. This division is somewhat arbitrary as children born before this point have survived, but only with significant medical assistance. This article is about human pregnancy in biological females. ...


In humans, birth normally occurs at a gestational age of 37 to 42 weeks. Childbirth occurring before 37 weeks of gestation is considered preterm, childbirth after 25 weeks is usually considered "viable". [2] Preterm and low birth weight babies make up the second leading cause of infant death at about 17%. [citation needed] Preterm births solely consist of 12% of infant deaths with an 84% majority within the 32-36 week period. [3] It is estimated that two million babies worldwide die annually within 24 hours of birth. dodger when a dick go in side a big fat vigiana


Mammals

Main article: Pregnancy (mammals)

In mammals, pregnancy begins when a fertilized zygote implants in the female's uterus; and ends once it leaves the uterus. This article does not cite any references or sources. ... A sperm cell fertilizing an ovum This article is about reproduction in organisms. ... It has been suggested that Biparental zygote be merged into this article or section. ... This article is about female reproductive anatomy. ...


Below are average and approximate values ordered by gestation period:

Animal Average gestation period (days)
Rabbits 30
Cats 62
Dogs 65
Lions 110
Pigs 115
Sheep 150
Humans 259-294
Cattle 280
Horses 336
Elephants 600-660

Genera Pentalagus Bunolagus Nesolagus Romerolagus Brachylagus Sylvilagus Oryctolagus Poelagus Rabbits are small mammals in the family Leporidae of the order Lagomorpha, found in several parts of the world. ... Binomial name Felis catus Linnaeus, 1758 Synonyms Felis lybica invalid junior synonym The cat (or domestic cat, house cat) is a small carnivorous mammal. ... Trinomial name Canis lupus familiaris The dog (Canis lupus familiaris) is a domestic subspecies of the wolf, a mammal of the Canidae family of the order Carnivora. ... For other uses, see Lion (disambiguation). ... For other uses, see Pig (disambiguation). ... Species See text. ... This article is about modern humans. ... For general information about the genus, including other species of cattle, see Bos. ... Binomial name Equus caballus Linnaeus, 1758 The horse (Equus caballus, sometimes seen as a subspecies of the Wild Horse, Equus ferus caballus) is a large odd-toed ungulate mammal, one of ten modern species of the genus Equus. ... Genera and Species Loxodonta Loxodonta cyclotis Loxodonta africana Elephas Elephas maximus Elephas antiquus † Elephas beyeri † Elephas celebensis † Elephas cypriotes † Elephas ekorensis † Elephas falconeri † Elephas iolensis † Elephas planifrons † Elephas platycephalus † Elephas recki † Stegodon † Mammuthus † Elephantidae (the elephants) is a family of pachyderm, and the only remaining family in the order Proboscidea...

References

  1. ^ National Center for Health Statistics - Multiple Births
  2. ^ March of Dimes - Preterm labor and birth
  3. ^ March of Dimes - Preterm Birth

External links


  Results from FactBites:
 
Gestation Network (179 words)
This site contains software for calculating gestational age, estimated fetal weight, customised fetal growth charts and birthweight centiles.
Disclaimer: The Gestation Network and authors of the software cannot accept responsibility for any clinical diagnoses or decisions made on the basis of programmes downloaded from this site.
GROW - customised software programmes contain algorithms based on published principles and formulae which are copyright of the Gestation Network.
Gestation Periods and Animal Scale (1140 words)
The gestation periods of other animal reveals that the length of the gestation period is largely a matter of the animal specie's size.
Thus the gestation period should be proportional to the scale of the animal.
The conclusion is that the nine-month gestation period for humans is merely a matter of human size and not the result of some evolutionary optimization.
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