What is the classification of twin pregnancy? Wow! How lucky! I am pregnant with twins, so lucky that I gave birth to two at once and successfully completed the task. Having twins, I am both happy and anxious. Do twins require any special care? What's the difference between having a single child? What is the classification of twin pregnancy?
Twin pregnancies are mainly divided into two categories: dizygotic twins and monozygotic twins.
1. Double egg twin: A twin pregnancy formed by the fertilization of two eggs, also known as a dizygotic twin. About two-thirds of twin pregnancies occur, and two eggs can originate from the same mature follicle, or from different mature follicles in the same ovary, or from mature follicles in both ovaries. Because the genes of the two fetuses of double egg twins are different, the sex and blood type of the fetus can be the same or different, and the appearance is similar to that of ordinary brothers and sisters. The two fertilized eggs can form their own independent placenta and fetal sac. They can closely adhere and fuse together during development, but the blood circulation between the two is not connected. The septum between the gestational sac is composed of two layers of amniotic membrane and two layers of chorion, sometimes the two layers of chorion can melt into one layer.
2. Monozygotic twin: A twin pregnancy formed by the division of a fertilized egg, known as monozygotic twin, accounting for approximately one-third of twin pregnancies. The cause of monozygotic twins is unknown, and their occurrence is not influenced by race, genetics, age, parity, or medical origin. Due to the genetic similarity of fetuses, their gender, blood type, appearance, and other characteristics are the same. The placenta and membranes of monozygotic twins vary depending on the time of replication of the fertilized egg.
What are the classifications of twin pregnancies? Twin pregnancies can be mainly divided into two categories: dizygotic twins and monozygotic twins. Double egg twin is a twin pregnancy formed by the fertilization of two eggs separately. Monozygotic twins are twin pregnancies formed by the division of one fertilized egg. Double egg twins account for about 2/3 of twin pregnancies, while monozygotic twins account for about 1/3 of twin pregnancies.
