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Child development milestones are key indicators of a child's growth. They enco various asp of development, incl language acqui, motor ski, and soc interactions. O example i taking a fi step, wh typically occurs around the age of twelve months. These milestones are useful in helping parents and caretakers monitor a child's progress. It is important to remember, however, that these milestones only provide a general guide, and each child develops at their own pace.
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参考答案：mpass ects uding sition lls ial ne s rst ich