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Vanishing Twin Syndrome

Welcome to this Nub Hub guide. This article is designed to help you understand the topic and feel more confident in your pregnancy journey.

Table of Contents

  1. What Is Vanishing Twin Syndrome?
  2. Why It Happens
  3. Symptoms and Discovery
  4. Emotional Impact and Outlook
  5. FAQ

What Is Vanishing Twin Syndrome?

Vanishing twin syndrome occurs when one baby in a multiple pregnancy is lost in the early weeks and is absorbed by the body, while the other baby continues to develop. It is often discovered when an early scan shows two gestational sacs or embryos, but a later scan shows only one. The phenomenon is relatively common, particularly in pregnancies conceived through fertility treatment where early scans are routine.

Why It Happens

In most cases, the lost twin had a chromosomal abnormality or developmental issue that meant it could not survive. The body naturally stops its growth and absorbs the tissue, usually without causing harm to the surviving baby. Vanishing twin syndrome is not caused by anything the mother did, and it is not linked to everyday activities, stress, or lifestyle. It is simply the body recognising that one pregnancy could not continue.

Symptoms and Discovery

Some women experience mild bleeding or cramping when a twin is lost, while others have no symptoms at all and the loss is only noticed at a subsequent scan. Because early ultrasounds are more common with fertility treatment, vanishing twin is often detected in these pregnancies. In naturally conceived pregnancies, it may go completely unnoticed if no early scan was performed. If you experience bleeding, contact your care team for assessment.

Emotional Impact and Outlook

Learning that you were carrying twins and now carry one can bring mixed emotions. You may feel relief that the surviving baby appears healthy alongside sadness for the twin who was lost. Both feelings are valid. Talking to your partner, a counsellor, or a support group can help. The good news is that when vanishing twin occurs in the first trimester, the surviving baby usually develops normally with no additional complications.

FAQ

### What is vanishing twin syndrome?

Vanishing twin syndrome is when one baby in a multiple pregnancy is lost early on and absorbed by the body, while the other continues to develop. It is often found at a follow-up scan.

Does vanishing twin syndrome harm the surviving baby?

In most cases, the surviving baby develops normally with no additional complications, especially when the loss happens in the first trimester.

Will I have symptoms if I lose a twin?

Some women have mild bleeding or cramping, but many have no symptoms and the loss is only discovered at a later scan. Contact your care team if you notice any bleeding.

This article is for informational purposes only and does not constitute medical advice.

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