And parents aren't the only ones who should be involved. Expect your child to be included, too—particularly those who are facing an ongoing condition. "At the appropriate developmental stage—a 3-, 4-, or 5-year old should begin to be part of the conversation," says Britto. This means an age-appropriate explanation of what is happening and why. She also believes kids should start to be involved in decisions about their care—even simply deciding which arm they would prefer a shot in.