Most children develop conservation skills during concrete operational stage of cognitive development.
The concrete operational phase means around three components Conservation and reversibility: Conservation is the insight that objects can change in size, volume, or appearance but essentially remain the same.
The concrete operational phase is the third stage in Piaget's theory of cognitive development. This period stays around seven to eleven years of age and by the development of organized and logical thinking.
The preoperational stage happens from 2 to 6 years of age and is the two stage in Piaget's stages of cognitive development. Throughout most of the preoperational background, a child's thinking itself-centered, or egocentric.
To know more about cognitive development visit the link
brainly.com/question/28011228
#SPJ4
