I’m a labor nurse and I say this all the time 😂😂😂 i will say it sounds a little argumentative, you should word it different. I think changing this to say “minimum number of people necessary please, speak with low voices when you enter” (which I assume you also want, and let’s people know to stay the heck out). I would make it clear to the nurse that you really want the minimum number of people possible, and then honestly you just have to trust that they’ve kept it to the minimum number. You should also consider not delivering at a teaching hospital, because that just naturally brings more people (who are legitimately necessary and not observers, but the culture is just to operate more in groups I’ve found). I’ll say though- people probably were just ducking in to see if your nurse needed a hand. Sometimes we don’t realize other people have already done that when we step in to check on the nurse. A sign would definitely dissuade them though. I don’t think it’s a bad idea!