At age 3, Rick Santorum’s daughter Bella, who has been hospitalized for the second time during his presidential campaign, has outlived the majority of children born with Trisomy 18, a relatively common chromosomal defect that occurs in one out of every 3,000 to 5,000 live births and is three times more common in girls than boys.
Children with Trisomy 18, also known as Edwards syndrome, have three copies of chromosome 18, instead of the normal two, in their cells. Many pregnancies with affected fetuses miscarry, and half of all affected babies who are carried to term will be stillborn, according to the Trisomy 18 Foundation. Most cases aren’t inherited but occur as a random error in cell division during the formation of eggs and sperm, according to the National Library of Medicine.
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