In fact, there is a wide variation in natural twinning rates. The natural incidence of twins is as high as one in 30 in Africa, and in other parts of the world, the rate is very low. It tends to be transmitted maternally, where you would have the likelihood of releasing two eggs. I would like to know a little more about the family history. Yes, they are identical.
Conjoined twins are monozygotic.
They do have to be identical. Conjoined twins are very rare. The occurrence rate is one in 500 twin pregnancies and one in 80,000 births. My ultrasound shows that my baby is very small. One thing it might mean is that your dates might be an error.