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The early child period is considered to be the most important developmental phase throughout the lifespan.
The embryonic period in humans begins at fertilization (penetration of the egg by the sperm) and continues until the end of the 10th week of gestation (8th week by embryonic age).The period of two weeks from fertilization is also referred to as the germinal stage.ince the precursors of all the major organs are created by this time, the fetal period is described both by organ and by a list of changes by weeks of gestational age. Because the precursors of the organs are now formed, the fetus is not as sensitive to damage from environmental exposure as the embryo was.