twins and multiplesThe process of conception does not always stop at one baby. A pregnancy of more than one fetus at the same time is called a multiple pregnancies. While the majority of multiple pregnancies refer to twin/triplets, with the increase in the use of fertility drugs, the incidence of multiples has recently been growing in numbers.

There are various situations that may lead to the conception or growth of a multiple pregnancies. For the sake of discussion, the twin/triplet pregnancy is easiest to understand.

Dizygotic twins/trizygotic triplets (fraternal or non-identical) are created when a female releases more than one egg or ovulates two or three times and all eggs are fertilized. Monozygotic (maternal/identical) twins or triplets are created if one egg is released, only one sperm fertilizes the egg, and the egg splits into multiple embryos.

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