Keith; Barbara Luke eds. Park Some women may even have dreams that they are pregnant with non-identical twins. The two eggs, or ovaform two zygoteshence the terms dizygotic and biovular. Are there factors that increase your odds of having fraternal twins?
These babies will be no more alike than siblings born at separate times. The result is either two male twins, two female twins, or one male and one female. What makes fraternal twins a joy to the families that have them is that they may or may not look alike. Your chances of having twins will depend not just on your use of fertility drugs, but also your family history, race, age, and many other factors.
After it splits, there are either two males or two females. Most triplets and other higher-order multiples are born by planned caesarean and many believe that you have to have a caesarean section with twins also. The need for frequent, intensive prenatal care is of the utmost importance in a multiple pregnancy.
Department of Health and Human Services.
Usage is practically equivalent with heteropaternal superfecundation , which occurs when two different males father fraternal twins, because though superfecundation by the same father is thought to be a common occurrence, it can only be proven to have occurred with multiple fathers.
Dizygotic twins are also more common for older mothers, with twinning rates doubling in mothers over the age of This phenomenon is called superfecundation. If pregnancy does occur with the first embryo transferred, you can keep the cryopreserved embryos "on ice" for future siblings, or they can be donated to another couple or to scientific research.
Main article: Twin-to-twin transfusion syndrome.