Mono Mono Twins And The Facts

Mono Mono Twins And The Facts - Monoamniotic twins are identical twins that share the same amniotic sac within their mother’s uterus. Monoamniotic twins are always identical, and always monochorionic as well (sharing the same placenta), and are sometimes termed Monoamniotic-Monochorionic ("MoMo") twins. They also share the placenta, but have two separate umbilical cords. Monoamniotic twins develop when an embryo does not split until after formation of the amniotic sac at about 9 days after fertilization. Monoamniotic triplets or other monoamniotic multiples are possible, but extremely rare. Other obscure possibilities include multiples sets where monoamniotic twins are part of a larger gestation such as triplets, quadruplets, or more. The couple also learned the babies were rare mono mono twins, a pregnancy that happens once in every 10,000 births, in which twins share the same placenta and amniotic sac. 

The different kinds of twins
1. Monochorionic twins are identical twins who share one placenta. This occurs in approximately 70 percent of pregnancies with identical twins.
2. Monochorionic-monoamniotic twins are identical twins who share both a placenta and an amniotic sac .
3. Monochorionic-diamniotic twins are identical twins who share a placenta but not an amniotic sac.
4. Dichorionic twins each have their own placenta and amniotic sac. This occurs in approximately 30 percent of pregnancies of identical twins. All fraternal (non-identical) twins also are dichorionic twins.
Problems that can affect the health of monochorionic twins include.
1. Birth weight differences
2. Amniotic fluid problems
3. Umbilical cord entanglement or compression
4. Twin-to-twin transfusion syndrome (TTTS)
5. Twin reversed arterial perfusion sequence (TRAP sequence)
6. Increased risk of birth defects in each twin