According to Piaget, what is the term for the stage where children develop object permanence?

The stage where children develop object permanence is known as the Sensorimotor stage, which occurs from birth to approximately 2 years of age according to Piaget's theory of cognitive development. During this stage, infants learn about the world primarily through their sensory experiences and motor actions. Object permanence is a key milestone that develops around 8 to 12 months, when children begin to understand that objects continue to exist even when they cannot be seen, heard, or touched. This cognitive advancement signifies that the child is beginning to form mental representations of the world around them. The development of object permanence is crucial because it lays the foundation for further cognitive developments that occur in later stages as children's thinking becomes more sophisticated.