Why did the IVF twins become a single birth?

Patient's question:

I've been married for several years, and so far, we haven't had any children. I'm very anxious about it and don't know if it's my problem. I've asked my husband to get checked, but he refuses. I'm afraid my condition might worsen. Please tell me why a test-tube baby for twins becomes a single baby.

Doctor's answer:

Hello, one of the twins did not survive, but it has no impact on the other. You can continue the pregnancy. During delivery, a cesarean section can be performed to remove the other twin at the same time. This is similar to a teratoma—it is benign and has little impact on the body. The reason it stopped developing is a natural selection phenomenon. Since twins compete for nutrients, one wins while the other loses. The one that loses cannot survive, so it dies. Now that there is no one competing with it, it will develop well in the future. Don't worry.

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