Cause of pregnancy with twins| How are twins born?

Whenever you have more than one baby in your womb, that type of pregnancy is called a multiple pregnancy. 

And when there are two babies, it is called twins. Twins are of two types: identical twins and non-identical twins. Now let's understand how twins are born. In reality, the chances of having twins are the same for all females, meaning 1 out of every 250 females has a chance of having twins.

Yes, if your age is over 35 years, the chances of having twins are higher. Or if there is a history of multiple pregnancies in your family, you might also have twins. Additionally, African women have higher chances of twin pregnancies. Whenever more than one egg in your uterus is fertilized by sperm, a multiple pregnancy occurs.

And sometimes, a single fertilized egg splits into 2 embryos, resulting in twins. If one egg splits into more than 2 embryos, it results in 3, 4, or more babies. Let's understand how identical twins are born. Identical twins occur when a single fertilized egg, also known as a zygote, separates into 2 embryos. 

Due to the splitting of the same egg, both parts have the same genes and thus become identical twins. Identical twins are always of the same sex, meaning both will be males or both will be females. Now let's talk about how non-identical twins are born. Non-identical twins occur when 2 different eggs are fertilized in your womb.

 Because they do not share the same genes, these twins do not look alike. Non-identical twins can be of the same sex or different sexes, such as one male and one female. 

Source:- 1. https://www.nhs.uk/pregnancy/finding-out/pregnant-with-twins/ 

               2. https://www.stanfordchildrens.org/en/topic/default?id=overview-of-multiple-pregnancy-85-P08019