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Excerpted from The Baby Bump, Twins and Triplets Edition

Twins 101: Types Of Twins

Dichorionic, diamniotic, monochorionic, monoamniotic — wondering what it all means? We've broken it down.
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Dichorionic Diamniotic

Fraternal or identical twins who have their own placenta and amniotic sac.

Photo:
Megan Rojas / The Bump
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Monochorionic Diamniotic

Identical twins who share the same placenta but have different amniotic sacs.

Photo:
Megan Rojas / The Bump
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Monochorionic Monoamniotic

Identical twins who share the same placenta and amniotic sac.

Photo:
Megan Rojas / The Bump