Fragile X syndrome is the most frequently occurring cause of learning disability. It affects twice as many boys as girls, and the symptoms in boys are usually more severe. It can cause developmental delays in children with other symptoms sometimes similar to autism, and difficulties with language, learning and social interaction as well as emotional and behavioural problems. There are often some physical characteristics associated with the condition but these are difficult to detect in a baby or young child and as a result, diagnosis is often delayed until problems become apparent.
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