Lifespan Development Periods The purpose of this paper is to disc

This is the period during which a one-cell organism grows into a human baby. Eisenberg, Murkoff and Hathawy (1991) provide an extensive discussion of this period, pointing out that development proceeds according to genetic instruction. Gestation, the term commonly used to refer to all of the development occurring before birth, is said to occur in three stages: germinal, embryonic, and fetal.

According to the authors, it is during the germinal stage (fertilization to about two weeks) that the organism divides, grows more complex, and is implanted in the wall of the uterus. Cell division is rapid, moving from a single cell to a fluid-filled sphere (blastocyst) to an embryonic disk (a thickened cell mass) that will eventually develop into layers comprising discrete parts of the baby's physical body, e.g., the sensory organs, the digestive system, the skeletal-muscular system, and so forth. The blastocyst also develops into the nurturing and protective organs including the placenta, umbilical cord, and the amniotic sac.

The embryonic stage (2 to 8-10 weeks) is the period in which

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oming one of the major problems of the period. Simon and Olds (1991) also report that a key social and personality issue related to this lifespan period relates to the development of the self-concept and the influence of others such as the child's teachers and his/her peers. These collectives operate to help shape the nature of the child's developing self-concept. The decline of egocentrism is also said to make the child more sensitive to others and more able to see themselves from differing viewpoints. The authors also state that both social and personality development during this lifespan period are influenced by several factors, many of these being related to the child's school experiences. For example, the child's degree of involvement in extra-curricular activities such as sports and how he is treated and how well he perceives himself as doing will all input into his self-concept. Further, the nature of a child's peer group and the degree of pressure that is put on him to conform to peer group values and behavior can influence self-concept. However, in most cases, children during this lifespan period always pick a peer group that is very much like themselves, dresses like they do, thinks like they do and so forth. Other
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Approximate Pages = 16 (250 words per page)