Trisomy 18 (Edwards Syndrome) (cont.)
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Incidence of Trisomy 18
Trisomy 18 occurs, on average, in 1 out of every 5,000 babies. Girls are affected far more commonly than boys. Any woman can have a child with trisomy 18, but the risk increases with increasing maternal age.
Medically Reviewed by a Doctor on 10/28/2014
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