Approximately half of pregnancies with trisomy 13 result in miscarriage or stillbirth between 12 weeks' gestation and term.

Do babies with trisomy 13 miscarry?

Babies with trisomy 13 have severe intellectual and physical problems. Many pregnancies with trisomy 13 will miscarry and babies that are born with trisomy 13 usually do not live beyond the first few weeks of life. A high risk result for trisomy 13 does not mean the baby definitely has trisomy 13.

When do trisomy babies miscarry?

Most pregnancies with a rare trisomy miscarry before 10- 12 weeks of gestation. A pregnancy that progresses beyond this gestation may have mosaicism, which means there is a mixture of normal cells and cells with the rare trisomy.