Amanda is currently in the sensorimotor stage of development.According to Piaget,when will her parents know that her object concept is fully mature?

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According to Piaget, object concept is fully mature when the child reaches the A-not-B error stage, which involves searching for covertly displaced objects. The A-not-B error occurs when the child repeatedly finds an object hidden at location A, but, when the object is hidden at location B (which the child can see), the child still searches for it at location A. This error signifies that the child has not fully developed their understanding of object permanence and that objects can exist even when out of sight. Therefore, when Amanda is able to search for objects that have been covertly displaced (e.g. hidden at location B) without making the A-not-B error, her object concept can be considered fully mature.

Amanda Is Currently in the Sensorimotor Stage of Development