Shapiro BK, Batshaw ML. Intellectual disability. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF, eds. Nelson Textbook of Pediatrics . 19th ed. Philadelphia, Pa: Elsevier Saunders; 2011:chap 33.
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The physician must have a high index of suspicion to consider the diagnosis of mental retardation in any child. Some helpful clues include delayed speech, dysmorphic features (minor anomalies), hypotonia generally or of the extremities, general inability to do things for self and, not least, expressed concern by the parents.
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