A 10-month-old infant searching for a block hidden under a blanket demonstrates the development of what cognitive concept?, What is the name of the stage in which a child first gains the cognitive ability for conservation of numbers (typically around age 7 years)?, Name the first stage of cognitive development (0-2 years) where infants learn exclusively through their senses and physical actions., In which substage of the Sensorimotor period (4-8 months) are infants encouraged to play "Peek-a-boo" and use a mirror?.

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