Multiple Pregnancy

Symptoms

• More intense early pregnancy symptoms, such as severe nausea and vomiting (morning sickness), fatigue, and breast tenderness.
• Faster than usual growth of the uterus.
• Greater than expected weight gain, especially in the first trimester.
• Feeling more fetal movement than in a single pregnancy (usually later on).
• Increased back pain, shortness of breath, swelling (edema) in the legs and ankles, and varicose veins.
• Emergency Symptoms (Contact your doctor immediately):
• Signs of preterm labor before 37 weeks: regular contractions, pelvic pressure, or a change in vaginal discharge.
• Signs of preeclampsia: a severe headache that won't go away, vision changes, severe pain below the ribs, or sudden swelling of the face and hands.
• Any vaginal bleeding or a gush of fluid from the vagina.
• A significant decrease in your babies' movements.

Causes & Risk Factors

• Fraternal (Dizygotic) Twins: This type is caused by hyperovulation, which is when the ovaries release more than one egg in a single cycle. Each egg is then fertilized by a different sperm. This can be influenced by genetics and hormonal factors.
• Identical (Monozygotic) Twins: This type is caused by the splitting of a single fertilized egg. The reason for this split is not fully understood and is generally considered a random event.
• The overall increase in multiple pregnancies in recent decades is largely due to two factors: more women having children at an older age and the increased use of assisted reproductive technologies (ART) like IVF.
• Use of Assisted Reproductive Technology (ART): Fertility treatments like in-vitro fertilization (IVF) and ovulation-inducing medications are the strongest factors associated with multiple pregnancies.
• Maternal Age: Women over 30, especially between 35 and 39, have a higher chance of releasing more than one egg during a cycle.
• Family History: A family history of fraternal twins on the mother's side increases the chances.
• Previous Pregnancies: Having had previous pregnancies (higher parity) is linked to a higher likelihood of having fraternal twins.
• Race/Ethnicity: Rates of twinning are highest in women of Black African descent and lowest in women of Asian descent.
• Body Type: Taller women and women with a higher Body Mass Index (BMI) have a slightly higher rate of fraternal twinning.

Diagnosis

• Ultrasound: An ultrasound is the definitive way to diagnose a multiple pregnancy. It is a safe and painless imaging test that can confirm how many babies you are carrying.
• Determining Chorionicity: The most critical part of the first ultrasound is determining the 'chorionicity'—whether the babies share a placenta. This is best done in the first trimester (ideally between 11 and 14 weeks). Your sonographer will look for specific signs, like the 'lambda (λ) sign' for separate placentas or the 'T-sign' for a shared placenta. This information is the single most important factor in planning your care and monitoring.
• Blood Tests: While blood tests may show higher levels of pregnancy hormones like hCG, they cannot be used to diagnose a multiple pregnancy.

Treatment Options

• Care for a multiple pregnancy is specialized and should be managed by a multidisciplinary team, often including a Maternal-Fetal Medicine (MFM) specialist.
• Increased Antenatal Care: You will have more frequent prenatal appointments and ultrasounds than someone with a single pregnancy to monitor the growth and well-being of each baby and to screen for complications.
• Nutritional Guidance: Your caloric, protein, iron, and folic acid needs are higher. Your doctor will provide specific recommendations for diet, supplements, and weight gain (typically 37-54 pounds for a twin pregnancy if you have a normal BMI).
• Close Monitoring for Complications: You will be regularly screened for conditions that are more common in multiple pregnancies, such as preeclampsia (high blood pressure) and gestational diabetes.
• Specialized Care for Monochorionic Pregnancies: If your babies share a placenta, you will need more intensive monitoring, with ultrasounds often performed every two weeks starting from 16 weeks, to watch for specific conditions like Twin-to-Twin Transfusion Syndrome (TTTS).
• Medications: Your doctor may recommend low-dose aspirin to reduce your risk of preeclampsia. If you are at risk of preterm birth, you may be given corticosteroids to help your babies' lungs mature.
• Delivery Planning: The timing and method of delivery depend on the type of multiple pregnancy, the position of the babies, and your overall health. Vaginal delivery may be an option if the first baby is head-down. A Cesarean section is often recommended if the first baby is not head-down, for monoamniotic twins (who share a sac), or for triplets and higher-order multiples. Delivery is typically planned earlier than for a single pregnancy, with recommended timing varying by chorionicity (e.g., 37-38 weeks for uncomplicated dichorionic twins, earlier for monochorionic twins).

Frequently Asked Questions