Skip to Content
Genetic disorders, such as
Down syndrome or
cystic fibrosis, and birth defects occur more
frequently in multiple pregnancies than in pregnancies with one fetus. A group
of deformities of the ankles and/or feet (clubfoot) is an example of a birth
defect seen more commonly in multiple pregnancy.
disorders and birth defects occur more frequently in identical fetuses than in
fraternal ones. In rare cases, problems occur when the genetic material
(chromosomes) in the fertilized egg does not split evenly. This can result in
severe mental or physical defects in one or more fetuses.
Conjoined (Siamese) twins occur rarely. This occurs when the egg does not
split completely and the fetuses are partially joined.
Most doctors advise pregnant women to be screened for genetic disorders.
ByHealthwise StaffPrimary Medical ReviewerSarah Marshall, MD - Family MedicineSpecialist Medical ReviewerWilliam Gilbert, MD - Maternal and Fetal Medicine
Current as ofMay 30, 2016
Current as of:
May 30, 2016
Sarah Marshall, MD - Family Medicine & William Gilbert, MD - Maternal and Fetal Medicine
To learn more about Healthwise, visit Healthwise.org.
© 1995-2016 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.
© Copyright 2017 Rush Copley Medical Center • 2000 Ogden Avenue; Aurora, IL 60504
Main: 630-978-6200 • Physician Referral & Information: 630-978-6700 or 866-4COPLEY (866-426-7539)