Telling babies apart

Rebecca • I live in the uk....twins due in a few weeks 😊
I was just wondering how long did it take you to be able to tell one baby from the other (if same sex obviously) my boys are most likely not identical but I'm sure there is still a chance they will look alike. Does it take long to just know or did you leave their hospital bands on for a while? Just curious really 🙂💙💙🙂