Final answer:
The inability to bear weight is the most reliable indicator of a fracture in a child. Lack of movement, tenderness, and bruising are also symptoms but are less definitive. A medical examination and X-ray are essential for diagnosis.
Step-by-step explanation:
The most reliable indicator of a fracture in a child would likely be inability to bear weight on the affected limb. While other symptoms such as lack of spontaneous movement, point tenderness, and bruising can be associated with fractures, they can also occur with soft tissue injuries and are not as definitive. In contrast, if a child is reluctant or unable to support weight on a limb, this can indicate a more serious injury, such as a fracture. A thorough medical examination, often including a radiograph (commonly known as an X-ray), will provide definitive evidence of a fracture.
It's also important to understand that even if a bone is fractured, it does not always translate into a complete lack of movement or visible bruising immediately. Due to these possible variations, seeking professional medical evaluation when a fracture is suspected is crucial.