During the sensorimotor stage the infant acquires a basic understanding of what Piaget called conservation.

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During the sensorimotor stage, which occurs from birth to about 2 years old, infants do not yet understand the concept of conservation, which involves recognizing that the amount of a substance or object remains the same even when its appearance or arrangement changes. Conservation typically develops during the preoperational stage, which occurs from about 2 to 7 years old.

During the Sensorimotor Stage the Infant Acquires a Basic Understanding