These diagrams illustrate how the different kinds of twinning can look on an early ultrasound.
Dichorionic/Diamniotic (di/di) twins:

Monochorionic/Diamniotic (mo/di) twins:

Monochorionic/Monoamniotic (mo/mo) twins:

Trichorionic/Triamniotic (tri/tri) triplets:



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