A multiple pregnancy is when a woman is pregnant with 2 or more fetuses. Twins are the most common type of multiple pregnancy.
This type of pregnancy can have a higher risk of problems during and after pregnancy. A care team can help to decrease these risks.
|Twins in Utero|
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Multiple pregnancies occur when:
- Single egg divides and develops into 2 or more fetuses (identical)—babies will be same sex and look similar
- More than 1 egg is fertilized by a different sperm (fraternal)—babies look different and may be different sexes
If there are 3 or more fetuses they may be identical, fraternal, or both.
Women over 30 are more likely to have a multiple pregnancy.
Factors that may increase your changes of having a multiple pregnancy include:
- Use of fertility treatments
- A previous multiple pregnancy
- A family history of multiple births
- More than 1 previous pregnancy
Symptoms include the following:
- More rapid weight gain than expected in the first trimester
- Severe morning sickness
- More fetal movement than with a single fetus pregnancy
The number of fetuses can be found with normal prenatal tests. The doctor may suspect twins based on your history or symptoms. It can be confirmed with :
- Ultrasound—can create images of fetuses
- Fetal heartbeat—more than 1 heart beat can be hear during a routine exam
- Certain blood tests done near the 16th week of pregnancy—will show higher levels with more than 1 fetus
You may be referred to a specialist.
Pregnancy itself does not need treatment. Your care team will watch for possible problems. Regular visits with your care team will help to keep the mother and baby well.
Potential problems that will be watched for include:
Most multiple births will end before 37 weeks of pregnancy. Babies born preterm have a higher risk for many health problems. Bed rest or medicine may help to delay early birth. Medicine may also be given to help the baby's lung mature if labor may start before 34 weeks of pregnancy.
Gestational diabetes is a high level of blood glucose during pregnancy. It can affect both the mother and baby's health. Treatment can help to return blood glucose levels to normal. It may include changes in diet, exercise, blood glucose level testing, and medicine.
Preeclampsia is a fast and dangerous increase in blood pressure during pregnancy. Treatment may include medicine, rest, and delivery of the babies.
Abnormal Fetal Position (Breech or Transverse)
Twin Twin Transfusion Syndrome (TTTS)
TTTS may happen with identical twins. Fetuses can share a tube to the placenta. If this sharing is unequal, TTTS can develop. One twin gets less blood. The other may end up with too much blood and fluid in the body. It can affect the health of both babies. Fetus growth and heart beat will be closely watched.
Multiple fetuses are more likely to have growth issues. Sometimes, one may be much smaller than the other. This can be normal or signal a problem. Growth will be carefully watched.
The risk of c-section is higher with more than 1 fetus.
Women will also have a higher chance of heavy blood loss after giving birth.
Multiple pregnancy with natural conception can not be prevented. Fertility treatments can lead to a multiple pregnancy. The care team will work to make sure the number of possible pregnancies is safe.
American Congress of Obstetricians and Gynecologists http://www.acog.org
March of Dimes http://www.marchofdimes.org
Health Canada http://www.hc-sc.gc.ca
The Society of Obstetricians and Gynaecologists of Canada http://www.sogc.org
American College of Obstetricians and Gynecologists (ACOG), Society for Maternal-Fetal Medicine. ACOG Practice Bulletin No. 169: Multifetal gestations: twin, triplet, and higher-order multifetal pregnancies. Obstet Gynecol 2016 Oct;128(4):e131, reaffirmed 2016.
Multiple gestation. EBSCO DynaMed Plus website. Available at: http://www.dynamed.com/topics/dmp~AN~T113875/Erectile-dysfunction . Updated November 26, 2018. Accessed January 8, 2019.
Multiple pregnancy. American College of Obstetricians and Gynecologists website. Available at: http://www.acog.org/Patients/FAQs/Multiple-Pregnancy. Published July 2015. Accessed January 8, 2019.
- Reviewer: Monica Zangwill, MD, MPH
- Review Date: 01/2019
- Update Date: 01/08/2019