Types of Multiple Pregnancies
Multiple pregnancies are defined as when a mother conceives two or more babies in one pregnancy.
There are 3 types of multiple pregnancies are:
Fraternal or dizygotic twins are the common type of multiple pregnancies among the 3. Dizygotic means two cells where the baby is conceived with two separate eggs and sperm. The twins might not look similar to each other and may have of different sex as they are born out of different cells.
Identical or monozygotic twins happen when a fertilized egg divides into two. As they are from one egg or monozygotic, their features are identical including their sex. They grow to be more like mirror images of each other.
Sesquizygotic twins are a relatively new concept for the types of multiple pregnancies. One of the studies shows that two different sperm cells fertilize a divided egg cell. It has the characteristic of both fraternal and identical twins where the baby is almost identical, but conceived from two sperm.
Causes of Multiple Pregnancy
One of the causes of multiple pregnancies is IVF or in vitro fertilization. There are cases where there are two embryos that sit in the uterus, one from the IVF where a fertilized cell is transferred to the uterus, and the other by natural conception.
It has also been observed that women who are older than 35 are more likely to have multiple pregnancies. Older women have higher chances of releasing more than one egg cell during their cycle, which also increases the chances of multiple pregnancies.