Gestation is the carrying of an embryo or fetus inside female viviparous animals. 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 (multiple gestations).
The time interval of a gestation is called the ''gestation period''. In human obstetrics, ''gestational age'' refers to the embryonic or fetal age plus two weeks. This is approximately the duration since the woman's last menstrual period (LMP) began.
(詳細はzygote implants in the female's uterus and ends once the fetus leaves the uterus.
On the main article link above, are average and approximate gestation values ordered by number of days (note: human gestational age is counted from the last menstrual period; for other animals the counting method varies, so these figures could be 14 days off)
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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