Roza 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, the object concept is fully mature when a child can search for covertly displaced objects. This ability is demonstrated in the sensorimotor stage's final substage (substage 6, beginning around 18 months), indicating the development of object permanence to its fullest extent, where the child understands that objects continue to exist even when they cannot be seen and can follow their displacement.

Roza Is Currently in the Sensorimotor Stage of Development