Twin and Multiple Pregnancy: What Makes It High Risk and How We Monitor It
Twin and multiple pregnancies require closer monitoring because carrying more than one baby places additional demands on the body. Your care team also needs to track each baby’s growth and development individually.
This does not mean something is wrong. With appropriate prenatal care and monitoring, many patients carrying twins or multiples have healthy pregnancies and healthy babies.
Why Are Twin Pregnancies Considered Higher Risk?
Carrying twins or higher-order multiples increases the chance of several pregnancy complications. These can include preterm birth, preeclampsia, gestational diabetes, and differences in how the babies grow.
Twin pregnancies also have a higher chance of Cesarean delivery.
These complications are not guaranteed. Instead, the increased risk means your care team will monitor you and your babies more closely. This allows providers to identify potential concerns early and respond when needed.
What Increases Your Chances of a Multiple Pregnancy?
Several factors can increase the chance of having twins or multiples, including:
- Fertility treatments such as IVF
- A family history of fraternal twins
- Being over age 30
- Having a previous twin or multiple pregnancy
Multiple pregnancies can also happen without any of these factors.
Once a twin pregnancy begins, one of the most important factors is chorionicity. This refers to whether the babies have separate placentas or share one. Chorionicity often has a greater effect on pregnancy risk than how the pregnancy was conceived.
Twin and Multiple Pregnancy Care in Lancaster County
Lancaster Maternal Fetal Medicine provides specialized monitoring for patients carrying twins or multiples throughout Lancaster County and the greater Reading area.
Our maternal fetal medicine specialists work alongside your OB or midwife to coordinate the additional ultrasounds and specialty scans that multiple pregnancies may require.
This approach allows you to receive advanced pregnancy monitoring while continuing care with your existing provider.
Identical vs. Fraternal Twins: Does It Change the Risk?
Not all twin pregnancies have the same risk level. One of the most important differences is whether the babies share a placenta or amniotic sac.
Dichorionic Diamniotic Twins
Each baby has its own placenta and amniotic sac. This is commonly seen with fraternal twins, although some identical twins can also have separate placentas.
This type generally carries fewer placenta-related risks than twins who share a placenta.
Monochorionic Diamniotic Twins
These identical twins share one placenta but have separate amniotic sacs.
Because they share a placenta, blood vessels can connect the babies’ circulations. This creates a risk of conditions such as twin-to-twin transfusion syndrome, also called TTTS.
These pregnancies usually require more frequent ultrasound monitoring.
Monochorionic Monoamniotic Twins
These twins share both a placenta and an amniotic sac.
This is a rare type of twin pregnancy that requires especially close monitoring because the babies’ umbilical cords can become entangled.
Your care team will usually determine chorionicity during an early ultrasound. That information helps guide your monitoring schedule throughout pregnancy.
Extra Monitoring You Can Expect With Twins
Twin and multiple pregnancies often require more frequent appointments than pregnancies with one baby.
Your care plan may include several forms of additional monitoring.
More Frequent Ultrasounds
Regular ultrasounds allow your care team to monitor each baby’s growth individually.
This is important because twins do not always grow at exactly the same rate. Your provider will watch for significant growth differences and other signs that one baby may need closer attention.
Cervical Length Monitoring
Multiple pregnancies have a higher risk of preterm birth. In some cases, your provider may monitor cervical length with ultrasound to look for signs of early cervical shortening.
Fetal Echocardiography
Some twin pregnancies, particularly certain monochorionic pregnancies, may benefit from a fetal echocardiogram.
This detailed ultrasound evaluates the structure and function of each baby’s heart.
Non-Stress Testing
Your provider may add non-stress tests later in pregnancy. These tests monitor your babies’ heart rates and movements to help assess their well-being.
Expecting twins or multiples? Schedule a consultation with Lancaster Maternal Fetal Medicine to discuss a monitoring plan designed around your specific pregnancy.
Common Complications With Twin Pregnancies
Preterm birth is one of the most common concerns with twins and multiples. More than half of twins are born before 37 weeks of pregnancy.
Other complications may include preeclampsia, gestational diabetes, and growth discordance. Growth discordance occurs when one baby grows noticeably larger or smaller than the other.
Monochorionic twins also need close monitoring for twin-to-twin transfusion syndrome. TTTS develops when blood flow through a shared placenta becomes uneven between the babies.
Early detection is important because treatment may be available when significant problems develop.
Delivery Planning for Twins
The safest delivery plan depends on several factors, including chorionicity, each baby’s position, your health, and how the pregnancy progresses.
Many patients carrying dichorionic twins can have a vaginal delivery, especially when the first baby is positioned head-down.
If the second baby is not head-down, vaginal delivery may still be possible in some situations. Your care team will consider the baby’s position, estimated size, and other factors before making a recommendation.
Monoamniotic twins often require a planned C-section because sharing an amniotic sac increases the risk of umbilical cord complications.
Your providers will discuss delivery timing and method with you well before your due date so you understand the plan and the reasons behind it.
The Lancaster MFM Approach
At Lancaster Maternal Fetal Medicine, we tailor twin and multiple pregnancy care to the specific risks of each pregnancy.
Your care may include detailed ultrasound monitoring based on chorionicity, fetal echocardiography when appropriate, growth scans, and additional monitoring for patients at higher risk of preterm delivery.
Our specialists work closely with your OB or midwife so that ultrasound findings, test results, and recommendations become part of one coordinated pregnancy plan.
Frequently Asked Questions About Twin Pregnancy
Are all twin pregnancies considered high risk?
Twin pregnancies generally require closer monitoring than pregnancies with one baby. However, the level of risk varies.
Twins with separate placentas usually have fewer placenta-related risks than twins who share one placenta.
How often will I need ultrasounds with twins?
Your ultrasound schedule depends largely on chorionicity and how the babies are growing.
Many twin pregnancies require growth ultrasounds about every four weeks. Monochorionic pregnancies may require more frequent monitoring.
Can I still have a vaginal delivery with twins?
Yes. Many twin pregnancies can result in vaginal delivery, especially when the first baby is positioned head-down.
Your provider will also consider the second baby’s position, each baby’s size, your health, and how the pregnancy has progressed.
What Is Twin-to-Twin Transfusion Syndrome?
Twin-to-twin transfusion syndrome is a complication that can occur in identical twins who share a placenta.
Blood flow through the shared placenta becomes uneven, causing one baby to receive more blood than the other. Frequent ultrasound monitoring helps providers look for early signs of TTTS.
Do Twin Pregnancies Always Mean Early Delivery?
No. However, preterm delivery is more common with twins and higher-order multiples.
Your care team will monitor the babies’ growth, your health, and any signs of complications when deciding on the safest time for delivery.
If you are expecting twins or multiples, schedule a consultation with Lancaster Maternal Fetal Medicine. Our specialists coordinate closely with your existing OB or midwife to create a monitoring plan based on your specific pregnancy.
