What age of an infant would illustrate Piaget’s concept of the coordination

What age of an infant would illustrate Piaget’s concept of the coordination of secondary schemes?

Coordination of secondary schemes (8-12 months)

At this stage, babies begins to act intentionally, that is, to coordinate schemes to achieve a desired result. For example, an infant may move one object to reach another.

What is Jean Piaget’s model for cognition in infant development including the schemes?
According to Piaget, children are born with a very basic mental structure (genetically inherited and evolved) on which all subsequent learning and knowledge are based. Schemas are the basic building blocks of such cognitive models, and enable us to form a mental representation of the world.