The emergence of several fertilized eggs

The emergence of several fertilized eggs may be the result of artificial insemination by IVF. At the bifurcation of the uterus also increases the likelihood of multiple pregnancies. Chance bigotry pregnancy genetically transmitted most often through the female line, due to inherited increased synthesis of FSH. Smaller part of monozygotic multiple pregnancies pregnancy. Twins develop from a single zygote. Doctors often called one such clone of another fruit. Zygote in the period from 2 to 15 days after fertilization simply divided into halves. If this separation was not fully completed by 13-15 days, the fruit can be spliced to any part of the body. An explicit example of such cases - Siamese twins depending on the timing of separation of the zygote will split and types:

•    2-3 days pregnancy: two embryos with certain precursors of the placenta (chorionic) and with its amniotic cavity;

•    4 to 7 days pregnancies: two amniotic cavity one common placenta;

•    From 8 to 12 days - monoamniotic, monochorionic pregnancy: general amniotic sac and placenta total.

After the second birth probability of multiple pregnancies is increased by 2 times, after the fifth - 5 times. After already held similar pregnancy chances are increased by 2.5 times. By 7 weeks of pregnancy on ultrasound can detect multiple pregnancies. It can be detected by multiple pregnancy and gynecological examination. The highest rate of multiple pregnancies with the birth of twins - in Africa, for example in Nigeria and in Japan is the lowest.