Children’s love of finger biting may be caused by physiological factors (in the oral sex period), psychological factors and nutritional element deficiencies. 1. Physiological factors: in the micturition period, when the appetite is not satisfied, there may be frequent finger biting to obtain psychological satisfaction. This phenomenon can be replaced by the use of comforting pacifiers. At the same time, communicate with your child more often. 2. Psychological factors: when the child is frequently under too much psychological pressure, nervousness and anxiety, especially when changing caregivers, the child will appear to love biting the phenomenon of finger. 3. Nutritional element deficiency: lack of zinc in the body, can be prone to food fetishism, biting some unconventional food, such as hair, fingers, wallpaper and so on. There are other reasons why children bite their fingers, so it is recommended to consult a doctor to find out the cause of the problem and treat it scientifically under the doctor’s guidance.