Twins 101: Types of Twins

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

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By Excerpted from The Baby Bump, Twins and Triplets Edition

Updated March 2, 2017

Image: Megan Rojas / The Bump

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Image: Megan Rojas / The Bump

Dichorionic Diamniotic

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

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Image: Megan Rojas / The Bump

Monochorionic Diamniotic

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

3

Image: Megan Rojas / The Bump

Monochorionic Monoamniotic

Identical twins who share the same placenta and amniotic sac.

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