At which substage of Piaget's sensorimotor period would you expect to first see children engaging in trial-and-error experiments on the world around them?

Name: At which substage of Piaget's sensorimotor period would you expect to first see children engaging in trial-and-error experiments on the world around them?
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In substage 5, known as the tertiary circular reactions stage, children begin to engage in trial-and-error experimentation to explore the world around them.

At Which Substage of Piaget's Sensorimotor Period Would You Expect