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- Stages may be inaccurate or completely wrong
-Might have underestimated the development of children
- Children may be less egocentric than he thinks

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Begins around age 12 and a child's thinking will become more advanced and intellectual.

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A child will become capable to understand mental operations and thoughts while using factual concepts

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Begins around age, children begin to learn how to manipulate situations and accommodate symbols.

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Typically lasts about 4-8 months, Babies will repeat actions that make them feel pleasure but with objects (shaking a rattle),

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The baby will continue to do actions that are pleasurable like sucking one's thumb

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Stage in which the baby will respond with reflex actions.