Which category does higher order multiples (triplets, quadruplets, etc.) fall into?
Higher order multiples (triplets, quadruplets, etc.) are all a variation of identical or fraternal multiples. For example, triplets can be caused by one egg fertilized by one sperm dividing into three. This means that the triplets would be genetically identical. Triplets could also occur if two eggs were fertilized by two sperm and then one egg divided in half. This would mean that two of the triplets would be genetically identical while the third child is considered a fraternal multiple. Similar scenarios occur in quadruplets and other forms of multiples.
