Sydney is in Piaget's "concrete operational" stage of development.
As the name suggests, the concrete operational stage of development can be characterized as the phase of cognitive development in which a child is equipped for playing out an assortment of mental activities and considerations utilizing solid ideas. All the more particularly, kids can comprehend that in light of the fact that a question changes shape or is isolated into pieces, the protest still holds certain critical attributes, for example, mass or volume.
