The most rapid prenatal changes take place during the

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During the period of the embryo (weeks 3-8), the most rapid prenatal changes occur. The embryo's major organs and systems begin to form, and the embryo becomes more recognizable as a human. By the end of this period, the embryo is about 1 inch long and weighs less than 1/10 of an ounce. The period of the zygote (week 1) is mostly focused on cell division, and the period of the fetus (weeks 9-40) is characterized by growth and development rather than rapid changes. The final trimester is important for the final preparations for birth, but it is not characterized by rapid changes like the period of the embryo.

The Most Rapid Prenatal Changes Take Place During the