* MoMo babies are always the same sex: either two boys or two girls. Like virtually all monozygotic twins, they are the same gender because they derive from the same gene set.
* MoMo twins are very rare. Only 1 percent of all twin pregnancies will be monoamniotic.
* The survival rate of MoMo twins is estimated at about 60%.
* Mothers of MoMo multiples should be cared for by a perinatologist (obstetrician specializing in high risk pregnancies), or should at least consult with an doctor experienced with MoMo twins.
* MoMo twins are often misdiagnosed in the early weeks of pregnancy when the membrane is so thin as to be nearly invisble. Often a later ultrasound reveals a dividing membrane confirming that twins are actually MoDi.