6–12 months

Six to twelve months is the fastest year-within-a-year I know: sitting frees the hands, crawling appears, and the fingers narrow from a whole-hand rake to a precise little pincer. Underneath all of it runs one big question — do things still exist when I can't see them? Every material here serves that movement or that question, and because babies genuinely outgrow materials in eight to twelve weeks, you need very few at a time — rotated, not piled.

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