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When two or more babies develop together, the babies may or may not share a placenta and an amniotic sac. This detail matters, because it changes the risks involved and how closely the pregnancy needs to be watched. Some twin pregnancies progress with very few extra concerns; others – particularly where the babies share a placenta – need a more structured surveillance plan from early pregnancy onward.
High-risk pregnancy consultation for a multiple pregnancy typically looks at:
Chorionicity determination is one of the first and most important steps in twin pregnancy care. It identifies whether your babies have separate placentas or share one placenta – information that shapes the entire monitoring plan going forward. This is best assessed early in pregnancy, when ultrasound can distinguish the placental arrangement most clearly. If your babies share a placenta, your fetal medicine specialist will explain what that means for the surveillance schedule ahead.
Serial twin surveillance means a planned series of ultrasound scans at set intervals through the pregnancy, rather than a single check. Each visit typically looks at:
The pace of this surveillance depends on your specific pregnancy – how the babies share (or don’t share) the placenta, and what earlier scans have shown. The goal is the right scan at the right time, not scans for their own sake.
Twins who share a single placenta are described as monochorionic. Because they share a common blood supply, monochorionic twin management involves a closer level of ultrasound surveillance than pregnancies where each baby has a separate placenta. Monitoring typically includes regular checks of growth, amniotic fluid, bladder filling, and blood flow for both babies, adjusted to gestational age and what earlier scans show.
One complication specific to monochorionic twins is Twin-to-Twin Transfusion Syndrome (TTTS), where blood flow through the shared placenta becomes unevenly distributed – one baby receiving relatively less, the other relatively more. TTTS surveillance uses ultrasound to watch for early signs of this imbalance, including changes in amniotic fluid volume and bladder appearance in each baby. If a concern is picked up, prompt specialist evaluation is important, and in select cases, fetal therapy may be discussed depending on severity and gestational age.
Twin Anaemia-Polycythaemia Sequence (TAPS) is a separate complication that can occur in some monochorionic twin pregnancies, involving an imbalance in red blood cell levels between the babies rather than fluid volume. Because TAPS doesn’t always show the same fluid changes seen in TTTS, TAPS surveillance relies more on Doppler assessment of blood flow in specific fetal vessels. Whether and how often this is needed depends on the individual pregnancy.
Twins rarely grow at exactly the same pace, and a small difference in size is common and often not a concern. Selective fetal growth restriction monitoring becomes relevant when the difference in growth between the two babies is more significant, especially in monochorionic pregnancies. This involves tracking each baby’s growth individually alongside Doppler blood-flow findings, to understand whether one baby is growing more slowly and whether that needs closer follow-up. A size difference on its own is not a diagnosis – the full picture, including Doppler results and placental findings, is what guides the next steps
Depending on how your pregnancy is progressing, your specialist may recommend a comprehensive fetal well-being assessment covering detailed fetal anatomy, growth, amniotic fluid, placental appearance, Doppler studies, and – when clinically relevant – cervical assessment. Each scan is explained beforehand, so you understand what it’s checking for and why it’s being suggested for your pregnancy specifically.
There is no single delivery plan that applies to every multiple pregnancy. Delivery planning takes into account the type of twin pregnancy, how each baby is growing, their position, the placental arrangement, and your own health. Planning this in advance also helps you and your family know where delivery is best placed, and whether additional newborn care support may be needed at birth.
A fetal medicine consultation for a multiple pregnancy is generally recommended if:
Early specialist involvement helps set the right monitoring plan for your specific type of multiple pregnancy from the start.
Dr. Rajeeb Jena is a Senior Obstetrician, Gynaecologist, and Maternal-Fetal Medicine Specialist with over 14 years of experience, holding an MS in Obstetrics & Gynaecology from JIPMER, Puducherry, a DNB in Obstetrics & Gynaecology, and super-specialty (FNB) training in Maternal-Fetal Medicine from Fernandez Hospital, Hyderabad. He has led the Maternal-Fetal Medicine Unit at AHANA Gynaecare and was involved in establishing the dedicated Maternal-Fetal Medicine Unit at KIMS Hospital, Bhubaneswar. Multiple pregnancy care at First Step is built around detailed ultrasound interpretation, an individualised monitoring plan, and clear communication – with coordination alongside your obstetrician, and neonatal or fetal therapy teams where needed.
A multiple pregnancy can carry a higher chance of certain complications for the mother and babies compared with a single-baby pregnancy. The actual level of risk depends on the number of babies, how the placenta is arranged, and the mother’s health, which is why individualised monitoring matters.
Chorionicity describes whether twins have separate placentas or share one. It’s best determined early in pregnancy, since twins sharing a placenta (monochorionic twins) need a different, closer surveillance plan.
This depends on whether your twins share a placenta and whether any findings need closer follow-up. Monochorionic twin pregnancies are generally monitored more frequently than pregnancies where each baby has a separate placenta.
TTTS (Twin-to-Twin Transfusion Syndrome) is a complication that can occur in monochorionic twins, where blood flow between the babies through the shared placenta becomes unbalanced. Regular ultrasound surveillance helps look for early signs of this.
TAPS (Twin Anaemia-Polycythaemia Sequence) involves an imbalance in red blood cell levels between twins, rather than the fluid differences seen in TTTS. It is monitored mainly through Doppler assessment of blood flow.
A small size difference between twins is common and not automatically concerning. If the gap is more significant, your specialist will look at growth trends, Doppler findings, and placental information together before recommending next steps.
Delivery timing depends on the type of twin pregnancy, each baby’s growth and well-being, positioning, and your own health. Your obstetrician and fetal medicine specialist will plan this together based on your pregnancy’s specific picture.
The information provided on this page is intended for general educational purposes only and should not be considered a substitute for professional medical advice, diagnosis or treatment.
Every multiple pregnancy is different. The recommended ultrasound schedule, fetal testing, treatment, monitoring and timing or mode of delivery depend on individual clinical circumstances. Conditions such as TTTS, TAPS and selective fetal growth restriction require specialist assessment. Please consult a qualified obstetrician or fetal medicine specialist for advice regarding your pregnancy.
