It happens when one embryo or fetus in a multiple pregnancy stops developing while the other continues to grow.
It most commonly occurs during the first trimester, often before 12 weeks of pregnancy.
Chromosomal abnormalities are a common cause. Early developmental or placental problems may also play a role.
Often, there are no obvious symptoms. Some women may notice light spotting, mild cramps or pelvic discomfort.
An early ultrasound may show two embryos, while a later scan may show that one has stopped developing.
The pregnancy tissue is usually gradually reabsorbed by the body, placenta or remaining pregnancy tissue.
When the loss happens early, the remaining baby can usually continue developing normally with a good outlook.
Yes. A later loss may require closer monitoring, especially when the twins share a placenta.
IVF pregnancies are monitored early, so the loss of one embryo in a multiple pregnancy may be detected sooner.
Your doctor may recommend additional ultrasounds. Speak with your fertility specialist for personalised guidance and follow-up care.