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An embryo is a human in the initial stages of development. This stage of development covers the time from implantation to the beginning of the eighth week after conception.
In the first stages of pregnancy, the embryo is undergoing the processes that determine the sex of the baby. This stage of development is characterized by the laying down of fundamental tissues and the formation of organs and organ systems. The embryo is referred to as such until the beginning of the third month of development, after which, it is referred to as a fetus.