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Separation, Using symbols and Object permanence  are stages of cognitive development of infants according to piaget.

According to Piaget, infants are only conscious of what is directly in front of them during the early stages. They concentrate on what they are doing, what they observe, and their bodily interactions with the surroundings. They are continually conducting experiments because they are unsure of how things will react.

Sensorimotor intelligence, preoperational thinking, concrete operational thinking, and formal operational thinking were the four main phases of cognitive development identified by Piaget. Each stage roughly corresponds to a period of childhood development.

To know more about cognitive development:

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