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The stage from birth to about 2 years old, when an infant learns about their surroundings through sensory impressions and motor activities.

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Piaget - Stage 1 - Sensorimotor, Object Permenence

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From 1-4 months: This substage is when coordinating sensations and new schemas begin. Certain actions are repeated because they please the infant.

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From 4–8 months: This substage is when babies begin to repeat certain actions that involve objects as well as actions involving their own bodies.

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From 8 to 12 months: This substage is when babies begin intentional adaptations to specific situations, so they think about actions more.

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The stage from about 7 to 11 years old, when children can begin to think logically.

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The stage that starts at about 12 years old, when a child thinks logically about abstract ideas and can form concepts about things that they have experienced.

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The stage from 2 to about 7 years old, when a child uses language, but does not think logically.

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Preoperational Stage Activities | Early Childhood Education

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Overtime, scientists have been able to find many flaws in the theories of Piaget about the development of children. He did not account for differences in a child's surroundings, not all children can be put into specific stages for when they cross a specific milestone, and he underestimated the abilities of almost all young children. But, He also set a foundation for many scientists to follow, and he was correct in his studies to believe that new reasoning abilities require the stepping-stones of previous abilities.