I have no unusual tips. Just practical.
I work in pediatrics.
1) DO NOT bring your kids' food in with you. Did it occur that there are other children who may have severe allergic reactions, even to crumbs?
2) It's extremely rude to be on your cell phone, or even texting, while we're trying to take a history on your child. Please stop, otherwise we stand there looking like morons waiting for you to get off the phone.
That's all