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Birth of the child
(2001 being start, 2012 10yo) -
6 months
(2001 being start, 2012 10yo) -
9 months
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15 months
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15 months
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24 months, 2 yo
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24 to 36 months (2004-2005)
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2007-2008, 4 to 5yo
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Development of logical thinking, able to solve complex geometric and algebraic problems, dissolvement of egocentrism and understands conservation.