Selective Mutism (SM) is an anxiety disorder in which a child who is talkative at home is unable to speak in other settings, such as school. Parents often notice signs of SM when a child is 3 or 4 years old, and may spend a whole year in preschool without saying a word.

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選擇性失語症(Selective Mutism)是一種焦慮症,患有此症的小孩在家中可以很健談,但在某些特定地方,如學校就不説話。家長多數在小孩3或4歲時察覺他們有選擇性失語症,他們有可能上了一整年幼稚園,也沒有說過一句話。