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Multiple pregnancy is not an uncommon occurrence, affecting 2–3% of births. Prevalence rates vary significantly: in England and Wales 15.9 out of every 1000 women giving birth in 2016 had a multiple birth, whereas in the United States the twin rate was 33.4 per 1000 live births (triplet and higher-order births, 101.4 per 100,000 births) in 2016.
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