Again, most surviving twins are fine, although some of the research has pointed to an increased risk of: If vanishing twin syndrome occurs later in pregnancy, especially if the twins share one placenta, there are possible effects on surviving co-twins. This is especially true when the syndrome happens in the first trimester.
In most cases, the surviving twin isn't negatively affected by vanishing twin syndrome. Your caregiver will monitor you closely for signs of complications, but there are no specific treatments given for vanishing twin syndrome. If it occurs in the second or third trimester, your pregnancy may be considered high risk. Usually no treatment is necessary for you or your baby when vanishing twin syndrome occurs in the first trimester. Rarely, a vanishing twin isn't discovered until after delivery, when fetal tissue from the vanishing twin is visible in the placenta (or on the surviving twin) after it's delivered. Sometimes, only one fetus would be seen within a gestational sac, and the other would be empty (or have a fetus without a heartbeat). At a later ultrasound, though, one of the heartbeats – or embryo or fetal sac – wouldn't be found. Typically, your first ultrasound would detect two (or more) gestational sacs or two embryos, and you'd be told you're carrying twins. Most often a vanishing twin is diagnosed during an ultrasound. How will I know if I have a vanishing twin? Small placenta or other placental abnormalities.Use of assisted reproductive techniques.Chromosomal abnormalities in the vanished twin.Advanced maternal age (over 35) (This may simply be because multiple pregnancies are more likely in older women.).Usually we don't know what causes vanishing twin syndrome, but factors might include:
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