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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.
The duration of gestation in placental mammals varies from 18 days in jumping mice to 23 months in elephants. [43] Generally speaking, fetuses of larger land mammals require longer gestation periods. [43] Fetal stage of a porpoise. The benefits of a fetal stage means that young are more developed when they are born.
Prenatal development (from Latin natalis 'relating to birth') involves the development of the embryo and of the fetus during a viviparous animal's gestation.Prenatal development starts with fertilization, in the germinal stage of embryonic development, and continues in fetal development until birth.
Pregnancy is the time during which one or more offspring develops inside a woman's uterus (womb). [4] [13] A multiple pregnancy involves more than one offspring, such as with twins. [14] Pregnancy usually occurs by sexual intercourse, but can also occur through assisted reproductive technology procedures. [6]
In mammals, pregnancy is the period of reproduction during which a female carries one or more live offspring from implantation in the uterus through gestation. It begins when a fertilized zygote implants in the female's uterus , and ends once it leaves the uterus.
In common terminology, a baby is the very young offspring of human beings, while infant (from the Latin word infans, meaning 'baby' or 'child' [1]) is a formal or specialised synonym. The terms may also be used to refer to juveniles of other organisms.
Christine Schozer Farr, 34, works as a senior marketing manager at NBC News. Soon after her wedding, she became pregnant but miscarried, which happens in up to 20% of known pregnancies.
Gestational age at birth is on average shortened by various pregnancy aspects: twin pregnancy, prelabor rupture of (fetal) membranes, pre-eclampsia, eclampsia, intrauterine growth restriction. [29] The ratio between fetal growth rate and uterine size (reflecting uterine distension) is suspected to partially determine the pregnancy length. [30]