There are a number of causes for kidney disease in children, including but not limited to birth defects, hereditary diseases, infection, nephrotic syndrome, and systemic diseases. Treatment for kidney disease in children depends on the cause of the illness. Children with kidney disease often need treatment for anemia and growth failure. If the kidneys fail, they require dialysis or transplantation.
The National Institute of Diabetes and Digestive and Kidney Diseases website has a wealth of information on pediatric kidney disease: Kidney Disease in Children Growth Failure in Children with Chronic Kidney Disease Nutrition for Children with Chronic Kidney Disease
National Kidney Foundation's Children with Chronic Kidney Disease: Tips for Parents United Network for Organ Sharing's Organ Transplants: What Every Kid Needs to Know Medicare.gov's Children and End Stage Renal Disease web page American Association of Kidney Patients' Kidney Pals web page NephKids support group