These are the facts: a woman in Texas gave birth to four babies on Valentine's Day. Ace, Blaine, Cash and Dylan Montalvo were born in Houston, Texas. Conceived without fertility intervention, the family said they were just trying to have a sibling for their son, Memphis, who is two years old. There were two placentas, one shared by Ace and Blaine, and one shared by Cash and Dylan.
The babies are identified as two sets of identical -- or monozygotic -- twins. Monozygotic twins form when a single fertilized egg splits. In this case, two eggs were fertilized and then split. However, the boys could also be considered quadruplets, which are defined as four offspring born at one birth. The media is calling it "two sets of identical twins", a one-in-seventy-million longshot. Technically, the foursome also consists of two sets of dizygotic twins, as each boy is a twin in relationship to their brother outside of their monozygotic pairing. It can make your head spin!
What do you think? Would you call them quads? Or two sets of twins?
- Definition of Zygosity
- Understanding Zygosity
- All About Quadruplets
- All About Identical Twins
- Twin Pregnancy FAQ