Human Development
There are seven stages a human moves through during his or her life span. These stages include infancy, early childhood, middle childhood, adolescence, early adulthood, middle adulthood and old age.
Infancy is recognized as the stage of life from a human 's birth up until he or she learns how to speak: generally until the age of one or two. During this stage, the child transitions from a dependent toddler to a relatively active child; he or she is typically able to crawl, roll over and walk. In terms of physical development, the stage of infancy witnesses the most growth. Also during infancy the child gains a sense of trust when its caregivers provide affection and reliability, a lack of such emotional reenforcement would lead to mistrust that may result in future interpersonal family related dilemmas. Alongside physical and cognitive developments, a human during infancy experiences changes in senses: an infant 's hearing is well developed before birth, it can already recognize its mother 's voice and heartbeat subsequently. A child also has the ability to determine the sources of the sounds its hearing. This quality does, however, develop up until the infant reaches 18 months where his or her hearing ability is considered as good as that of an adult 's. A child 's sense of sight is known to be poor and blurry at birth, but as the child grows its eye-sight gets better naturally giving him or her clearer well-developed vision.
The stage that follows infancy is known as early childhood. This stage takes place from the age of 18 months up until the child is three. This stage witnesses significant changes in linguistic development as well as development in senses of personal control. They also begin widening their social environment and become more impulsive, adventurous and curious. A child within this particular stage will start to use words and eventually learn to communicate by forming sentences. During early childhood,