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The early child period is considered to be the most important developmental phase throughout the lifespan.
All of the processes of embryo development are described by the term embryogenesis. The embryo is called a fetus after the completion of this stage of development. The stage of prenatal development that occurs from the end of the embryonic period until birth is called the fetal period.The most notable development during this stage is the dramatic change in size that takes place. This is the baby's final preparation for life outside the womb.hink of Steve and Jennifer's baby as spending the germinal period looking for a place to live. Now that she's found her place, she's ready to start organizing for the work she has ahead of her. This is the embryonic period of prenatal development.