My policy is similar to the others. I too keep my door locked, so they must ring the doorbell. I have said they could come by anytime (except during nap), but then their child must leave with them then. Parents are very understanding, once it's explained to them that it's too confusing having parents come and go without their children during the day. With that said, I've never had parents come by early unexpected. They always tell me if they'll be coming earlier or if grandma or grandpa will be picking up the child.

I do however understand the "security check" idea by these parents. It's very hard on parents to leave their child with someone they don't know. So if they have no problem with the fact that if they "pop" by, then they also have to leave with their child, I would say great. I think more parents should be this way. I'm still surprised with my new families when they don't call the first couple of days just to check on their little one.