For the 9000 or so couples in the United Kingdom expecting twins each year, the risk of giving birth to a baby with a congenital anomaly is not only doubled because of the two babies but increased further because the average age of mothers of twins is higher than that of mothers of singletons. Furthermore twins, as such, particularly monozygotic pairs, are at a greater risk of being affected.
KeywordsDown Syndrome Monozygotic Twin Turner Syndrome Multiple Pregnancy Duchenne Muscular Dystrophy
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