Gestation

Gestation is the period during which an embryo or fetus develops inside a parent before birth. It ends with birth and varies in length among species.

Embryonic development: The early process by which an embryo forms tissues and organs. This phase establishes the body plan during the first part of gestation.
Pregnancy: The state of carrying one or more developing offspring in the body before birth. In humans, gestation is the developmental interval within pregnancy.
Incubation: The maintenance of eggs under conditions that support embryo development until hatching. Unlike gestation, incubation develops embryos outside the parent's body.
Gestational age assessment: The estimation of how far a pregnancy has progressed using dates, examination, or imaging. Estimating timing helps interpret development and guide prenatal care.
Fetal development: The growth and maturation of a fetus after the embryonic stage and before birth. It describes the later developmental phase of human gestation.
Embryo: An early stage of an organism's development before it is classified as a fetus or born. The embryo is the developing organism during the earlier part of gestation.
Oviparity: A reproductive mode in which animals lay eggs that develop and hatch outside the parent's body. It contrasts with gestation in which development occurs internally before birth.
Prenatal care: Health care provided during pregnancy to monitor and support the health of the pregnant person and developing fetus. Care is scheduled around changes and risks across gestation.
Placenta: An organ that develops during pregnancy and mediates exchange between parent and fetus. It supplies oxygen and nutrients and removes waste during gestation.
Fetus: A developing mammal after the embryonic stage and before birth. The fetus is the later form developing during gestation.

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