Use Piaget's first three stages of cognitive development to explain why young children are not just miniature adults in the way they think.Infants in Piaget's SENSORIMOTOR STAGE tend to be focused only on their own perceptions of the world and may, for example, be unaware that objects continue to exist when unseen.A child in the PROPORTIONAL STAGE is still egocentric and incapable of appreciating simple logic, such as the reversibility of operations.A preteen in the CONCRETE OPERATIONAL STAGE is beginning to think logically about concrete events but not about abstract concepts.