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Mono-Mono Twins

mono mono twins in utero Mono-Mono twins (Monoamniotic-Monochorionic or "Mo-Mo" twins) are always identical and incredibly rare. They will share both their amnions, chorions and placenta. They only happen in about 1% of monozygotic (identical twins) pregnancies. This is primarily due to a later splitting of the egg which results in a shared placenta and shared sac. (An extremely late split can even produce conjoined twins). This sharing of the amniotic sac with no barrier between the two babies is why this particular type of twin pregnancy in considered especially high risk. Monoamniotic-Monochorionic twins have a general in-utero mortality rate of approximately 50 %, largely due to cord entanglement.

If you have been diagnosed with "mo-mo" twins, you should be seeing a perinatologist (a doctor specializing in high risk pregnancies). Your extraordinary twin pregnancy will need much closer monitoring and expert care. Just keep in mind that your babies themselves are usually perfectly healthy, it is just their situation in the womb which is the cause for concern. It’s a good idea to talk with other parents who have gone through the same thing, as they can give needed support and first hand information on what to expect. Being well informed and connecting with someone who knows what you are going through may help to ease your worry.

Here are some places to start...

Monoamniotic Monochorionic Support Site

Mono-mono preemie twins blog: Katy and Mady

Read more about Mono-Mono Twins


Be sure to scroll down to read some personal stories from our visitors who have experienced this rare type of twin pregnancy.


Want To Share A Story About Your Mono-Mono Twins?

It's really simple to do and you could be helping many parents in the same situation by sharing your distinctive experience. Feel free to make your story as long, short, or detailed as you wish. If you would like to add a photo, that's okay too. You can even remain anonymous. You will be creating your own special page unique to the topic of Mono-Mono Twins. (photos must be between 800x600 pixels)

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Read What Other Visitors Have Experienced With Mono-Mono Twins

Just click on any of the titles below to see contributions from other visitors to this page.

Mono-mono twin girls pull through!  My twin baby girls were born at 31 weeks 6 days. My husband, Leslie and I were prepared to have premature babies since 12 weeks along. Our twins were confirmed ...

Terminated Our Mono/Mono Twin Pregnancy - I feel so guilty and sorry.  Earlier this summer my fiance and I discovered we were pregnant. (Actually, it was confirmed I was pregnant on the same day my Grandmother passed away....

SCARED  I am 19 and already have a 18 month old. I found out I am 18 weeks preganant with twins and they are mono mono. I find out their sex September 16, 2008....

A Scary But Healthy Mono-Mono Twin Pregnancy  I have 4 beautiful children, 2 boys and 2 girls. My sons are 7 and 2, while my girls are identical twins age 5.

My husband and I were overjoyed when ...

Guilt And Shock  I did not know I was carrying mono-mono twins until after they were born as my pregnancy was in the early 70's and ultrasound wasn't used as much.

I ...

God Needed Them More  About four years ago, I found out that I was pregnant. My husband and I were really excited because we had been trying to have a baby for two years prior ...



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