Each infant is born with an individual temperament. Theories that a child's personality depends entirely on environmental factors are now felt to be untrue. Infants are individuals from the very start.
Some come out active and screaming and maintain a high level of activity throughout life.
Others are very mellow at birth and continue with this personality trait. Infants exert a strong influence over their parents' behavior toward them.
An active child will quickly learn how to attract their parents' attention. Crying is a normal activity of all infants and serves many functions.
In a newborn, crying helps the lungs adjust from the fluid- filled amniotic sac to an air-filled world. Infants cry in response to their needs when they are hungry, wet, cold or, on occasion, pain.
This crying is a way of communicating with their parents and is effective because it usually produces the necessary response-a parent to alleviate their needs.
Parents quickly become adept at distinguishing different types of cries from those signaling hunger to pain, boredom or anger
