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Peut se manifester au cours de la 1e année de vie2 éléments principaux : déficits persistants de la communication et de l'interaction sociale, types de comportements, d'intérêts et/ou d'activités répétitifs et limitésDoivent être présents à un jeune âge et doivent être suffisamment sévères pour compromettre considérablement la capacité de l'enfant à fonctionnerComportement auto-agressifRituels répétifs/machinalUn des marqueurs les + précoces et les + sensibles est l'incapacité de l'enfant d'1 an à pointer les objets de façon communicative à distance

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