This information is provided by the American Academy of Pediatrics.  For the complete first aid guide, click here.

If an injured area is painful, swollen, or deformed, or if motion causes pain, wrap it in a towel or soft cloth and make a splint with cardboard or other firm material to hold the arm or leg in place. Apply ice or a cold compress wrapped in thin cloth for no more than 20 minutes. Call the pediatrician or seek emergency care. if there is a break in the skin near the fracture or if you can see the bone, cover the area with a clean bandage, make a splint as described above, and seek emergency care.

Note: If the foot or hand below the injured part is cold or discolored (blue or pale), seek emergency care right away.

Important note: The information contained here should not be used as a substitute for the medical care and advice of your pediatrician. There may be variations in treatment that your pediatrician may recommend based on individual facts and circumstances.

Source First Aid (Copyright © 2011 American Academy of Pediatrics)