This phenomenon happens when a woman is expecting twins, but one of the twins in the pregnant woman's womb disappears or vanishes. This happens as a result of a miscarriage of one of the twins. The dead fetal tissues of the miscarriaged twin is absorbed by the other twin, placenta, or the mother causing it to vanish. Instead of having twins, the woman will have only one baby.
Dad: "I can't wait to have twins! I'm going to be the happiest dad in the world!"
Mom: "I'm so sorry hun, the doctor told me I have vanishing twin syndrome. One of the twins absorbed the other one."

Dwight Schrute: "When my mother was pregnant with me, they did an ultrasound and found she was having twins, and they did another ultrasound a few weeks later, they discovered that I had resorbed the other fetus. Do I regret this? No. I believe his tissues made me stronger. I now have the strength of a grown man and a little baby."
by Undeveloped Peanut September 10, 2020
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