But the Olsen twins are these pre pubescent little girls who we used to watch have their diapers changed. They are like Americas baby sister. And now ... there are two of them. And certainly, where ...

When a fan asked how do you tell the twins apart ... my sisters' working," Olsen says. "It wasn't until a few years ago that I realized how hard that must have been for them.

Married at First Sight alums Jamie Otis and Doug Hehner have shared the specific ways they’re able to tell their newborn identical twins apart ... ways we can tell them apart,” Jamie continued.

Momo twins account for one percent of all twin pregnancies, making them extremely rare.