Embryo
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An embryo is the initial stage of development for a multicellular organism. In organisms that reproduce sexually, embryonic development is the part of the life cycle that begins just after fertilizati
A human embryo seven weeks after conception (nine weeks gestational age)
Embryos (and one tadpole) of the wrinkled frog (Rana rugosa)
Mouse and snake embryos
The inside of a Ginkgo seed, showing the embryo
Fetus
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A fetus or foetus is the unborn offspring of a viviparous animal that develops from an embryo. Following the embryonic stage, the fetal stage of development takes place. Prenatal development is a cont
Embryo
…of the body. A newly developing human is typically referred to as an embryo until the ninth week after conception, when it is then referred to as a fetus. In other multicellular organisms, the word embryo can be used more broadly to any early developmental or life cycle stage prior to birth or hatching…
Fourteen phases of elephant development before birth
Fetal stage of a porpoise
A human fetus, attached to placenta, at three months gestational age
3D ultrasound of 80-millimetre (3 in) fetus (about 3+1⁄2 months gestational age)