Pregnency

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Reasons For Multiple Pregnancies And The Types Of Multiples

Causes for multiple pregnancies

There are many factors of having a multiple pregnancy. Some of the natural factors include the below:

Heredity - A woman with a family history of multiple pregnancy increases the chances of having twins.

Old age - Women who are over the age of 30 have a higher chance of multiple pregnancies. Women these days are delaying pregnancy until later in life and may have twins as a result of this.

High parity - Previous pregnancies with one or more multiple pregnancy increases the chances of bearing multiples.

Race - African-American women are at more possibility of having twins than any other race. Whereas, Asian and Native Americans have the lowest multiple pregnancy rates. Caucasian women particularly over the age 35 are at the higher rate of higher-order multiple births (triplets or above).

Other factors that increased the multiple birth rates greatly in the recent years include reproductive technologies such as:

Ovulation stimulating drugs: Such as clomiphene citrate and FSH (follicle stimulating hormone) allow produce many eggs, which if fertilized can result in multiple babies.



Assisted reproductive technologies (ART):
Such as in vitro fertilization (IVF) and other techniques help women conceive. These technologies often use ovulation stimulating drugs to produce multiple eggs which are fertilized and placed into the uterus to develop.


The Types of Multiples


There are two types of twins:

Monozygotic Twins (called identical twins)

Dizygotic Twins (called fraternal twins)




Monozygotic Twins or Identical twins
are produced from a single fertilized egg dividing into two halves and continue to develop into two separate but are identical babies. These twins are genetically identical with same chromosomes and same physical characteristics. They are the same sex, the same blood type, hair color, and even eye color.



Fraternal twins
Are produced from two eggs fertilized by two separate sperms but are no more alike compared to other siblings born to the same couple. They may or may not be of the same sex. This type of twins is more common and only this type of twins is affected by heredity, race, maternal age, and number of prior pregnancies.



"Supertwins"
is a common word for triplets and above (other higher-order multiple births) such as quadruplets or quintuplets. These babies can be identical, fraternal, or a combination of these both.



Articles you may be interested in:

What Is Multiple Pregnancies And How This Happens ?

Why Is Multiple Pregnancy A Concern ?