To determine whether the baby’s arm has a fracture, the following aspects are important: First, the injured area is swollen and the skin is blue and purple in color. Second, the child will cry or hide when touching or moving the child’s limb in pain. Third, when you move the limb, you can hear the sound of bones clicking, suggesting that a fracture has occurred. Fourth, when you move the limb, you can feel the limb has become soft, which is called the bone tenderness sign. There are two other very important medical histories to consider when a fracture occurs: whether the child has a history of falls and whether there is a history of pulling, and whether there is a history of trauma before a fracture can be considered. Fifth, go to the hospital to take a frontal and lateral X-ray of the injury site, which can clarify the diagnosis.