How can doctors tell if you are having identical twins from an ultrasound?
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On the ultrasound, they look for a little line circling the fetuses. That’s the placenta. If the line goes between the two fetuses, there’s two placentas and they could be either identical or not. But, if they just see one circle with no line between, the fetuses are sharing one placenta, and in that case they are identical twins.
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