I don’t want to offend any of my guests, but what’s the most polite way to post on my Facebook…

I don’t want to offend any of my guests, but what’s the most polite way to post on my Facebook Event/ baby shower invitation that I’d like for parents to be responsible for their children and not let them help themselves multiple times to the treat table? I know it may seem tacky, but it’s something I literally have to do seeing that most people on his side of the family have multiple kids and let them carelessly run around.