He bangs his head and has a gigantic welt, but he's not dizzy or throwing up; should he go or not? She twisted her ankle on the jungle gym and it's swollen, black and blue, and she can't put pressure on it - go or give it a day? This preventative guide will help parents know in advance when it's an emergency, when a doctor should be consulted, and when to treat at home with a good dose of "suck it up kid." At a time when ERs have become waiting rooms...