Fetal development after fertilization of eggs

Usually, the ovary only releases one egg every month. At this time, if the egg meets the male sperm, a fertilized egg will be formed. After fertilization, the egg develops and grows in the mother's womb. After 10 months of pregnancy, the fetus will be born. Under normal circumstances, pregnant women only give birth to one baby at a time.

identical twins

If a fertilized egg is divided into two parts and develops and grows separately, two fetuses will be formed, which is called "monozygotic twins". Twin fetuses are not only identical in sex, blood type and genetics, but also difficult to distinguish in appearance.

Boys and girls twins

In another case, a woman's ovary releases two eggs at the same time, which are combined with sperm respectively to form two fertilized eggs. In this way, the two fetuses may not look so similar, and the sex may be different. It may be a man and a woman, commonly known as "twins".

Multiplexer

The same is true of the formation of triplets and quadruplets.