my opinion

Erikson's theory is still relevant today as it was when it was first developed over seven decades ago. 

Explanation of stage 

Stages arise as individuals grow and face new decisions and turning points during childhood, adolescence, and adulthood.

Erikson's Psychosocial Developmental Theory

Psychoanalytic theory was an enormously influential force during the first half of the twentieth century. Those inspired and influenced by Freud went on to expand upon Freud's ideas and develop theories of their own. Of these neo-Freudians, Erik Erikson's ideas have become perhaps the best known.

Cognitive theory is concerned with the development of a person's thought processes. It also looks at how these thought processes influence how we understand and interact with the world. Piaget proposed an idea that seems obvious now, but helped revolutionize how we think about child development: Children think differently than adults

Piaget's Cognitive Developmental Theory

my opinion:

intelligence changes as children grow. A child's cognitive development is not just about acquiring knowledge, the child has to develop or construct a mental model of the world.

Explanation of stage 

divided children's cognitive development in four stages, each of the stages represent a new way of thinking and understanding the world.

Bowlby

Bowlby proposed one of the earliest theories of social development. Bowlby believed that early relationships with caregivers play a major role in child development and continue to influence social relationships throughout life.

My opinion

Bowlby believed that the earliest bonds formed by children with their caregivers have a tremendous impact that continues throughout life. 

Explanation of stage :

secure attachment, avoidant attachment, and resistant attachment.