My twins are Monochorionic Diamniotic. Today I have been told there is a 30% chance they can be boy/girl. I am confused how can this be possible?

Monochorionic diamniotic twins are by definition identical, and share a placenta though they are in their own amniotic sacs. There is no way they could be different sex-unless they aren't actually monochorionic, but are instead dichorionic. We recommend that you should go back to your obstetrician or sonographer and ask them exactly what they mean.

Fraternal Twins
Fraternal (dizygotic) twins are the result of two separate eggs being fertilized by two sperms at the same time, so that two embryos implant and develop with two placentas. The twins may look different and be different sexes.

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Identical Twins
If an egg is fertilized by one sperm and then splits into two, the two embryos that are produced are always the same sex and are identical because they contain the same genetic material; these twins are known as monozygotic.

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