IntroductionFrom birth, the child begins to change constantly throughout his life. Human development occurs at different stages throughout life. A child will experience many stages from birth to infancy, throughout early and middle childhood, and several theories are related to these stages. Sigmund Freud, Jean Piaget, and Erik Erikson classify their various theories of life stages into three unique domains: physical, cognitive, and psychosocial/emotional. Childhood/Toddler (0-3 years) and Physical Domain The physical domain of lifespan development is continually changing physically the human body throughout its life. During infancy and early childhood, these physical changes occur very quickly and allow for human growth, tooth and motor development. While babysitting my two-year-old cousin who I have been helping since she was three months old, I have learned that this stage of life is the fastest part of the physical realm. That's because at three months old, my cousin, Brileigh, was totally dependent. Several months later, she was still mostly dependent, but Brileigh was starting to help her hold her bottle. In a short time, she learned to talk and walk. Today, at the age of two, she can walk, run, talk, climb and is very independent. Every time I see Brileigh, I'm amazed at how much she learns in a day or a week. Sigmund Freud observed different stages of child development and gave each stage a name based on the child's body. This research became known as psychosexual development. Stages are given an age range and then a title for a particular body part. From birth to one year is the oral stage, from one to three years is the anal stage, from three to six years...... middle of paper ... and the psychosocials flow together so perfectly in the others. Although we have this freedom, like anything else, it can go wrong if we do not assume the responsibilities we are supposed to have; in this case, her child. If humans could follow these theories and steps, there would not be such a high rate of abused, abandoned and neglected children. Some of these children grow up doing the same things to their children as their parents. Works Cited Garcia, J.L. (1995). Journal of Consulting and Development. Freud's conception of the psychosexual stage: A developmental metaphor for counselors. Ginsburg, H. J. (1992). Erikson's Childhood Injuries and Psychosocial Stages. Social behavior and personality: an international journal, 95-100. Papalia, DE and Feldman, RD (2012). Discover Human Development, Twelfth Edition. New York: McGraw-Hill.