A monitoring bracelet worn on an infant includes a camera, a prompter, a storage, and a processor. The processor controls the camera, when an object is grasped in a hand of the infant, to capture an image of the object. The processor analyzes size dimensions of the object according to the image and determines whether the object is able to fit inside the mouth of the infant, controls the camera to detect the object in real time when the object is determined to be able to fit inside the mouth of the infant and detects whether the mouth of the infant is opened, and controls the prompter to emit a prompt when the camera detects that the object is held steady in the hand of the infant and the mouth of the infant is opened.