During what substage does the infant's behavior,for the first time,occur not as accidents but as intentional,goal-directed behavior?

Question

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During substage 4, which is the "coordination of secondary schemes," infants begin to show intentional, goal-directed behavior for the first time. This substage marks the development where infants start to coordinate different schemas to achieve specific goals, indicating a more advanced level of cognitive development.

During What Substage Does the Infant's Behavior,for the First Time,occur