What is a multiple pregnancy?
A multiple pregnancy is when you carry more than one fetus in your uterus at a time. If your ovary releases more than one mature egg during a menstrual cycle (all of which are fertilized by sperm), it results in multiple embryos. This phenomenon produces fraternal twins (or triplets, etc.).
By contrast, the formation of multiple, identical embryos happens when a single fertilized egg breaks or splits. This kind of pregnancy produces identical twins. But can triplets be identical? Yes! Triplets, quadruplets, quintuplets, etc. may be fraternal, identical, or a combination of both. This essentially means that a multiple pregnancy could be the product of either of these two processes, or a blend of both.