Unverified85% confidenceDecision RuleTime unknown
0-2岁婴幼儿应选直径7-10cm、凸点柔软圆钝的触觉球，握球时手指能自然包裹超过半圈才不易脱手且能有效刺激掌心触觉；刺突过硬过尖的球适合3岁以上
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85%
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