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The prenatal stage of human development is a critical phase that lays the foundation for an individual's physical, cognitive, and psychological well-being. Life Span Psychology, which studies the patterns of growth, change, and stability in behavior throughout life, views prenatal development as the first and most formative stage in the human life span. This stage is not merely biological; it is also significantly influenced by environmental and psychological factors that may have long-lasting effects on the child’s life trajectory. ### Periods of Prenatal Development Prenatal development occurs in three primary periods: the germinal period, the embryonic period, and the fetal period. Each of these stages is marked by distinct biological and psychological transformations that play a critical role in the eventual outcome of birth and later stages of development. #### Germinal Period (Conception to 2 Weeks) The germinal stage begins at conception and lasts until the zygote (fertilized egg) implants itself into the uterine wall, typically about 10 to 14 days after conception. During this period, the zygote undergoes rapid cell division and forms a blastocyst, a hollow ball of cells that eventually develops into the embryo and supporting structures such as the placenta and amniotic sac. From a life span psychology perspective, although this period seems too early to influence psychological development, events in this stage can be critical. For instance, if the zygote fails to implant properly, the pregnancy will not continue. Genetic defects that may manifest later can also originate at this stage due to chromosomal abnormalities. Though the embryo is not yet connected to the mother's blood supply, environmental factors such as maternal health and hormone levels may still affect this process. #### Embryonic Period (3rd to 8th Week) The embryonic period is perhaps the most sensitive phase of prenatal development. During these six weeks, the major organs and structures of the body begin to form in a process known as organogenesis. The heart begins to beat around ___ _____ ________ ______ ______ ___ ____ ____ ______ _________.
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