0-6 months, Engages in immediate and deferred imitation of adults’ facial expressions., 7-12 months, Finds object hidden in an initial location., 13-18 months, Searches in several locations for a hidden object, 19-24 months, Recalls absent object or person, 2-3 years old, Make belief play becomes less depended on realistic objects, 3-4 years old, Able to categorise, development of false-belief, 5-6 years old, Improves in sustained attention and planning.

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