Marfan's syndrome is usually strongly inherited in families. This is known as autosomal dominant inheritance. However in some children with definite Marfan's syndrome there is no positive family history. This usually occurs as the result of a change in one of the gametes leading to the conception of the affected child. Expert genetic information is required before you consider having another child. I see that you have already been for counselling,but you do need to see a paediatric geneticist before making any decisions.
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