Trisomy 21: About 95% of people with Down syndrome have Trisomy 21.People often can’t tell the difference between each type without looking at the chromosomes because the physical features and behaviors are similar. This means that Down syndrome occurs in about 1 in every 700 babies. Each year, about 6,000 babies born in the United States have Down syndrome. How Many Babies are Born with Down Syndrome?ĭown syndrome remains the most common chromosomal condition diagnosed in the United States.
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