Based on the following observation, what specific cognitive milestone has this infant likely achieved? Explain your reasoning by connecting the infant's actions to the definition of this milestone.

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Issues in the sensorimotor stage of cognitive development include:

- Object permanence
- Stranger anxiety

Issues in Sensorimotor Stage of Cognitive Development

Object permanence is the cognitive understanding that objects continue to exist even when they are not in sight. According to Piaget, this key cognitive milestone is typically grasped by around 8 months of age. Before developing this concept, infants behave as if an object that is hidden from view has ceased to exist. Once toddlers (12-24 months old) master object permanence, they demonstrate this understanding through behaviors such as enjoying games like hide-and-seek and realizing that a person who leaves a room will return.

Object Permanence

According to Piaget, stranger anxiety is a fear of unfamiliar people that typically emerges in infants around the same time they develop object permanence.

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