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the 2-year-old baby is an important period for big action and muscle growth. at this time, children can use the building blocks to carry, build and dismantle to train big action muscles children before the age of 2 belong to the period of sensory movement. at this time, infants learn about the world through vision, hearing touch. building blocks can enhance children's cognitive range nothing is big or small. to do one thing completely from beginning to end is progress. even in the process of play, we can find that each child has different attitudes towards "doing things".syi