Early intervention is very important for autistic children.
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Clinical term. Also used casually online as hyperbole — 我自闭了 'I've gone into autism mode' means 'I'm shutting down / can't deal'. In a medical context, always use the full term.
usage
Autistic children are sometimes called 星星的孩子 'children of the stars' in Chinese media/charity campaigns, a softer term than the clinical 自闭症儿童.