Prenatal development can be thought of in terms of the germinal,embryonic,and fetal periods.Or,it can be thought of as three trimesters.In terms of the way time is divided into periods,these two viewpoints are

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The germinal, embryonic, and fetal periods view prenatal development in terms of developmental stages, while the trimester view divides time into equal segments. The germinal period spans from conception to two weeks, the embryonic period lasts from week 3 through week 8, and the fetal period lasts from week 9 until birth. The trimester viewpoint divides time into three equal segments of pregnancy but does not necessarily correspond to the developmental stages of prenatal development.

Prenatal Development Can Be Thought of in Terms of the Germinal,embryonic,and