The study will involve 30 children with chronic kidney disease and failure to grow. The study will last for 14 months. There will be a screening clinic visit if the child qualifies for the study, Week -8. Each clinic visit will include, getting a medical history, a physical exam, and a blood test. Also an x-ray of the wrist to calculate bone age. If abnormal blood values are found as a result of kidney failure then an attempt will be made to correct them over the next 2 months before enrollment in the study.