Gestation is the period of development during the carrying of an embryo, and later fetus, inside viviparous animals (the embryo develops within the parent).[1] It is typical for mammals, but also occurs for some non-mammals. Mammals during pregnancy can have one or more gestations at the same time, for example in a multiple birth.[2]
The time interval of a gestation is called the gestation period. In obstetrics, gestational age refers to the time since the onset of the last menses, which on average is fertilization age plus two weeks.[3]
^Mckay RJ, Lucey JF (June 1964). "NEONATOLOGY". The New England Journal of Medicine. 270 (23): 1231–6 CONTD. doi:10.1056/NEJM196406042702306. PMID 14132827.
^Keith L, Oleszczuk JJ (January 1999). "Iatrogenic multiple birth, multiple pregnancy and assisted reproductive technologies". International Journal of Gynaecology and Obstetrics. 64 (1): 11–25. doi:10.1016/S0020-7292(98)00230-6. PMID 10190665. S2CID 31814692.
^Liao JB, Buhimschi CS, Norwitz ER (June 2005). "Normal labor: mechanism and duration". Obstetrics and Gynecology Clinics of North America. 32 (2): 145–64, vii. doi:10.1016/j.ogc.2005.01.001. PMID 15899352.
Gestation is the period of development during the carrying of an embryo, and later fetus, inside viviparous animals (the embryo develops within the parent)...
In obstetrics, gestational age is a measure of the age of a pregnancy taken from the beginning of the woman's last menstrual period (LMP), or the corresponding...
A gestation crate, also known as a sow stall, is a metal enclosure in which a farmed sow used for breeding may be kept during pregnancy. A standard crate...
Gestational hypertension or pregnancy-induced hypertension (PIH) is the development of new hypertension in a pregnant woman after 20 weeks' gestation...
Gestational diabetes is a condition in which a person without diabetes develops high blood sugar levels during pregnancy. Gestational diabetes generally...
from the start of the last menstrual period (LMP), a span known as the gestational age. This is just over nine months. Counting by fertilization age, the...
This is a collection of lists of mammal gestation period estimated by experts in their fields. The mammals included are only viviparous (marsupials and...
development of the embryo and of the fetus during a viviparous animal's gestation. Prenatal development starts with fertilization, in the germinal stage...
Gestational (incidental) thrombocytopenia is a condition that commonly affects pregnant women. Thrombocytopenia is defined as the drop in platelet count...
relationship or legal agreement contains the gestational carrier and the child's parent(s) after birth, the gestational carriers are usually being referred as...
four weeks of gestation. The adrenal cortex originates from the thickening of the intermediate mesoderm. At five to six weeks of gestation, the mesonephros...
The gestational sac is the large cavity of fluid surrounding the embryo. During early embryogenesis, it consists of the extraembryonic coelom, also called...
ultrasound by six weeks after the woman's last menstrual period. Anembryonic gestation is one of the causes of miscarriage of a pregnancy and accounts for roughly...
Breeding occurs around the year, with peaks during heavy rainfall; after a gestation of 60 to 70 days, a litter of three to seven pups is born. They live in...
Small for gestational age (SGA) newborns are those who are smaller in size than normal for the gestational age. SGA is most commonly defined as a weight...
captivity, where they engage in mutual masturbation with their trunks. Gestation in elephants typically lasts between one and a half and two years and...
of gestation, and to some fetuses at 23 weeks of gestation with favourable risk factors. As of 2022, the world record for the lowest gestational age...
Gestational choriocarcinoma is a form of gestational trophoblastic neoplasia, which is a type of gestational trophoblastic disease (GTD), that can occur...
development begins from the ninth week after fertilization (or eleventh week gestational age) and continues until the birth of a newborn. Prenatal development...
rather than establishing pregnancy location. An ultrasound showing a gestational sac with fetal heart in the fallopian tube has a very high specificity...
Gestational trophoblastic disease (GTD) is a term used for a group of pregnancy-related tumours. These tumours are rare, and they appear when cells in...
Large for gestational age (LGA) is a term used to describe infants that are born with an abnormally high weight, specifically in the 90th percentile or...
an embryo or fetus before the 24th week of gestation. A pregnancy that ends before 37 weeks of gestation resulting in a live-born infant is a "premature...
external sexual organs will be evident between twelve and sixteen weeks of gestation. Preputial development is initiated at around eleven weeks or earlier...
Gestation III is a 1990 wooden sculpture by Baile Oakes, installed in Santa Monica, California's Palisades Park, in the United States. The sculpture measures...
(amnionicity). In humans, the average length of pregnancy (2 weeks fewer than gestation) is 38 weeks with a single fetus. This average decreases for each additional...
steps: Determination of which time point is to be used as the origin for gestational age. This starting point is the woman's last normal menstrual period...
a late stage of gestation. In this context, late is not precisely defined, and different medical publications use varying gestational age thresholds....
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