Twin Pregnancy: What Changes, What to Expect, and How It Is Managed
A pregnant woman speaking with a doctor in a clinical setting.
Discovering twins at a scan is often an instant mix of joy and alarm. The joy is clear. The alarm — "is this more dangerous?" — is legitimate and deserves a clear answer. Yes, twin pregnancy carries more risk than a singleton pregnancy. No, it is not unmanageable. With appropriate monitoring and specialist care, the majority of twin pregnancies result in healthy babies.
The most important variable is not how many babies — it is what type of twins.
Dr. Shachi Singh, consultant obstetrician at Prakash Hospital, Sector 33, Noida, explains.
Chorionicity: The Most Important Factor
Twins are either monozygotic (identical — from one egg that split) or dizygotic (fraternal — from two separate eggs and two sperm). But what matters clinically more than zygosity is chorionicity — whether the twins share a placenta or have separate placentae.
Dichorionic diamniotic (DCDA) twins: Two separate placentae, two amniotic sacs. Most common type. Dizygotic twins are always DCDA. Approximately 30% of monozygotic twins split early enough to be DCDA. Lower-risk twin type — though still higher risk than singleton.
Monochorionic diamniotic (MCDA) twins: One shared placenta, two amniotic sacs. Approximately 70% of identical twins. Higher-risk because of shared placental circulation — specifically the risk of twin-twin transfusion syndrome (TTTS).
Monochorionic monoamniotic (MCMA) twins: One placenta, one amniotic sac — the rarest and highest-risk type. Significant risk of cord entanglement. Managed in specialist centres.
How chorionicity is determined: The first-trimester scan (11 to 14 weeks) is the most accurate time to determine chorionicity — looking for the "twin peak" or lambda sign (DCDA) versus the "T sign" (monochorionic). This is why early dating and chorionicity determination is essential in twin pregnancy.
Additional Risks in Twin Pregnancy
Preterm birth: The most significant complication. The average gestational age at delivery for twins is 36 to 37 weeks — versus 40 weeks for singletons. Approximately 50% of twin pregnancies deliver before 37 weeks.
Preeclampsia: Significantly more common in twin pregnancy — the increased placental mass produces more of the placental factors driving preeclampsia. Low-dose aspirin from 12 to 16 weeks is recommended for all twin pregnancies.
Gestational diabetes: Higher risk from increased placental hormones driving insulin resistance.
Fetal growth restriction: More common, particularly in MCDA twins with unequal placental sharing.
Twin-twin transfusion syndrome (TTTS): Specific to MCDA twins — abnormal connections between the two fetal circulations in the shared placenta result in blood being transferred from the "donor" twin (who becomes anaemic, small, and oligohydramniotic) to the "recipient" twin (who becomes polycythaemic, large, and polyhydramniotic). Can be severe and life-threatening without treatment. Treated by fetoscopic laser ablation of the vascular anastomoses — a specialist intervention.
Anaemia: Greater iron and folate demands in twin pregnancy.
Postpartum haemorrhage: Greater uterine distension means the uterus may contract less effectively after delivery.
Antenatal Monitoring: What Is Different
DCDA twins: Growth scans every 4 weeks from 16 weeks. Anatomy scan at 18 to 20 weeks for both babies (two full anatomy scans). Blood pressure monitoring. GDM screening at 24 to 28 weeks. Delivery planning discussion from 36 weeks — most DCDA uncomplicated twins are delivered at 37 to 38 weeks.
MCDA twins: Growth scans every 2 weeks from 16 weeks — because of TTTS risk, more frequent monitoring is essential. TTTS screening specifically (liquor volume assessment, bladder visibility, Doppler studies). Delivery at 36 to 37 weeks in uncomplicated cases. Any suspicion of TTTS → urgent referral to a specialist twin centre.
Delivery of Twins
Mode of delivery depends on presentation of the first twin
If first twin is cephalic (head-down): Vaginal delivery is possible and generally attempted. After the first twin delivers, the second twin's position is assessed — it can be delivered head-first, breech (feet-first), or if necessary, internally rotated. The second twin may need internal podalic version (manual rotation) or caesarean if vaginal delivery is not possible.
If first twin is breech or transverse: Caesarean section is recommended.
MCMA twins and some complicated MCDA twins: Caesarean is recommended.
The key point: twin delivery should occur at a facility with immediate access to an experienced obstetrician, an anaesthetist, and a neonatal team capable of managing preterm twins.
Nutrition in Twin Pregnancy
Iron and folate requirements are higher — supplementation is essential. Protein requirements increase. Total calorie needs increase more than in singleton pregnancy (approximately 300 additional calories for twins rather than the 200 for a singleton). Gestational weight gain targets are higher: for a twin pregnancy with normal pre-pregnancy BMI, recommended gain is 17 to 25 kg.
Obstetric Care in Noida and Greater Noida
Dr. Shachi Singh at Prakash Hospital, Sector 33, Noida, provides specialist twin pregnancy monitoring and management for women across Noida and Greater Noida.
To book a consultation for twin pregnancy care, call: +91 97023 46853
Clinic Hours: Monday to Saturday, 9 AM – 6 PM | Sunday, 10 AM – 2 PM
Address: D-12A, 12B, Sector-33, G.B. Nagar, Noida, UP 201301
This blog is for educational purposes only. Twin pregnancy requires specialist obstetric monitoring.
