Over the last 40 years, corticosteroids (steroids) have been an important part of drug regimens used to prevent organ rejection and to maintain the immune health of individuals who have received organ transplants. Unfortunately, the negative physical effects of steroids can be severe, especially in children. The purpose of this study is to determine the safety and effectiveness of a steroid-free treatment regimen for children and adolescents who have received kidney (renal) transplants.