Unverified50% confidenceDecision RuleTime unknown
选头盔以头围为准而非年龄：用软尺测量眉毛上方约2cm处头围最大值，一般48-52cm适合3-5岁、52-56cm适合6-10岁，预留1-2cm可调节余量即可，切勿买大'留着长个'
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