How Twins Are Made

Parasakthi

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People are very fascinated with twins and other multiples. It seems mysterious how one pregnancy can result in more than one baby.


Multiple pregnancies are on the rise in recent years with more and more twins and other types of multiples being born. The majority of the reason for this rise is the increased use of fertility drugs.


How Twins Are Made


There are a couple of ways that multiples are conceived:
  • Multiple eggs are released or there is more than one ovulation. Both (or more) eggs are fertilized and you have fraternal twins. This can happen with or without fertility drugs.
  • One egg is release but splits in two. Identical twins are made. This can happen with or without fertility drugs.
  • In cases of IVF, there are usually 3 or more fertilized eggs put back into the uterus. The rationale is that not all of these will implant, though sometimes they do.
Once conceived you have a lot of possibilities on placentas, implantation locations, number of amniotic sacs. For example, you can have two babies, two placentas, and two sacs. You can have two babies one placenta, two sacs. It will be important to know exactly what you are dealing with, particularly when it comes to amniotic sacs.
 

Angu Aparna

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How twins are formed

Twins form in one of two ways:

Identical twins occur when a single fertilized egg splits into two. Identical twins look almost exactly alike and share the exact same genes. Most identical twins happen by chance.

identical-twins-illustration.jpg

Fraternal twins occur when two, separate eggs are fertilized by two, separate sperm. Fraternal twins do not share the exact same genes — they are no more alike than they are to their siblings from different pregnancies. Fraternal twins tend to run in some families.

fraternal-twins-illustration.jpg
 

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