According to Piaget's theory of cognitive development, during which stage will a child first start to look for something that has been hidden from view?

Jean Piaget's theory describes four stages of cognitive development. The first is the sensorimotor stage (birth to 2 years). A key concept in this stage is 'object permanence'. Initially, infants operate on an 'out of sight, out of mind' basis. If they cannot see an object, it ceases to exist for them. Towards the end of this stage (around 8-12 months), they develop object permanence and will begin to search for hidden objects, demonstrating that they have a mental representation of the object.