Find out everything you've always wanted to know about identical twins – from how they form to what makes them unique.

Even though Jed is a twin, that didn’t contribute to the conception. Fraternal twins are genetically connected to the mother’s line, and identical twins are considered spontaneous.

When people refer to Irish twins, it's important to recognize that although the siblings are close in age, they are not actually twins. In other words, they weren't born during the same gestational ...

Nationwide, twins occur in just around 3% of all births, according to national data. But the class of 2025 at one high school is a unique case.

The normal conception period for twins is 38 weeks. This is attributed to the increased demands on the mother’s body and inability of the fetuses to receive all the needed nutrients.

Counting On sibling Jedidiah Duggar and his wife, Katelyn Nakatsu, welcomed fraternal twin girls earlier this month.