MoMo is short for monoamniotic-monochorionic and refers to identical twins who are monozygotic which means they develop in a single amniotic sac and share a placenta.
Identical twins develop from one egg and one sperm combination that splits into two. If the split happens 8 to 13 days after conception, the processes of growing a placenta, chorion, and amniotic sac are already underway. The two embryos will then develop within a single, shared sac, resulting in MoMo twins.
The below photo is taken from wikipedia
- Twin-to-twin transfusion syndrome (TTTS): One twin receives the majority of the nourishment, causing the other twin to become undernourished.
- Cord entanglement: The close proximity and absence of an amniotic membrane separating the two umbilical cords make it easy for the twins to become entangled in each other's cords, hindering fetal movement and development.
- Cord compression: There is nothing to separate MoMo twins, which means their umbilical cords can become tangled over time and clog the cords.
- Selective intrauterine growth restriction (sIUGR) is a condition that occurs in twin pregnancies when one of the babies does not receive enough nourishment through the placenta to grow at a normal rate