Twins are relatively common. In fact, the number of live twin births in 2018 was 32.6 twins per 1,000 births. And while most of us know a pair of fraternal or identical twins — after all, if you grew ...

When you’ve just had identical twins, it’s normal to spend a lot of time looking down at their squishy little bodies and analyzing every subtle way they differ from one another. Unlike fraternal twins ...