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The majority of twins are fraternal twins (twins that look different from one another). Zygotic refers to zygote, the egg fertilized by the sperm that will develop into an embryo and grow into a baby.Learn more about fraternal twinning, from how they form to how they relate to each other, as well as how they differ from identical twins. Monozygotic twins come from a single egg and sperm that splits into two after conception.Because fraternal twins originate from separate conceptions, they can be boys, girls, or one of each.

(The likelihood of having twins, which happens when one fertilized egg divides in half, is holding steady at about 3 to 5 in 1000 births.

But the rise in multiple births was mostly due to women using fertility drugs and assisted reproductive technology (ART) to help them conceive.

These drugs and certain treatment decisions greatly increase the odds of having twins or higher order multiples. Fertility drugs stimulate your ovaries, increasing the odds that you'll release several eggs at the same time.

This rate hasn't changed over the decades and is remarkably constant all over the world.) It was partly due to more women waiting longer to have a baby.

Hormonal changes as you age make it more likely that your body will release more than one egg at a time – and more than one fertilized egg often means more than one baby.