Explore trisomy 13 syndrome in this guide—learn about its meaning, causes, symptoms, and the available treatment options to ...

Each baby gets 23 chromosomes from the mother's egg and ... Trisomy 18 is the second-most common type of trisomy syndrome, after trisomy 21 (Down syndrome). About 1 in every 5,000 babies are ...

had Trisomy 21, and it was "pretty rare to conceive three babies with Down Syndrome." This combined image shows Ashley Zambelli, 23, left, and Zambelli with her daughter Lillian, right.

For most people, each cell in the body has 23 pairs of chromosomes ... while with the more common trisomy 21, every cell has three copies of chromosome 21. Can people with Down syndrome have ...

Humans, by contrast, have 23 pairs of chromosomes, or 46 altogether. With Down Syndrome, a person's cells contain a third copy of chromosome 21 -- hence the disorder's scientific name, trisomy 21.