Hello,
Please be assured the fracture pain can be severe even if the fracture may be small. Immobilisation of the limb and elevation of the limb is important to reduce pain. Along with the same it is very important that you apply ice to the affected area frequently for first 72 hours or 3 days to control the pain. Apply for 10-15 minutes at one site.
Next Steps
Apply ice frequently, children tend to be active so will require elevation of the limb by putting pillow under the affected leg for swelling to come down.