Remove clothing from the injured area.
Apply an ice pack wrapped in cloth.
Keep the injured limb in the position you find it.
Place a simple splint, if you have one, on the broken area. A splint holds the bone still and protects it until the child is seen by the doctor. To make a temporary splint, you can use a small board, cardboard, or folded up newspapers and wrap it with an elastic bandage or tape.
Get medical care and don't allow your child to eat or drink in case surgery is required.