Trisomy 18 (Edwards Syndrome) Topic Guide
Trisomy 18 (Edwards Syndrome): Trisomy 18 is an chromosomal condition that causes severe birth defects in newborns. Many babies born with trisomy 18 do not live past one month of age. Trisomy 18 is also known as Edwards Syndrome.
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Pregnancy Pregnancy occurs when an egg is fertilized by a sperm, grows inside a woman's uterus (womb), and develops into a baby. In humans, this process takes about 280 days.