We're expecting identical twins. I'm afraid I won't be able to tell them apart! What if I mix them up?
Many parents of twins are nervous about this, but after the babies are born, you will notice differences between them even if they are identical. But that doesn't necessarily help at 2 AM when you're bleary-eyed from lack of sleep, and they suddenly look exactly alike!
Our first set of twins was fraternal and it was easier to tell them apart, but even then we had family coming in to help us with the babies, and they found it especially hard to tell who was who. So we quickly found some helpful tricks to make it easier for everyone.
One classic tip is to paint a toenail of one baby. But it isn't always practical to rip off baby's socks and shoes to check identity. So, we assigned each baby a designated color and dressed them accordingly. The color was matched to a chart for each baby to track their feeding, sleep and diaper-change schedule. These were invaluable for keeping things straight when we had multiple caregivers (no pun intended!).
Having twins definitely introduces more complexity to your life, but with a little organization, it isn't too difficult to keep things straight.