I do that too! One of my kids was born on an odd year, month, and day, while the other was born on an even year, month, and day. They know who is who and they d

I do that too! One of my kids was born on an odd year, month, and day, while the other was born on an even year, month, and day. They know who is who and they don't argue with the calendar. (We do it by day of month and we find another way to decide if we need to on the 31st.)