Baby biting fingernails should be treated and regulated according to specific triggers. Common triggers include psychosomatic factors, micronutrient deficiencies, iron deficiency anemia, and so on. Need for the cause of the targeted treatment, such as more care for the child, supplemental trace elements, correct anemia, etc.. 1. Spiritual and psychological factors: if the baby is due to excessive mental tension, psychological fear, resulting in fingernail biting, the main thing is to do a good job of regulating the baby’s emotions, more care, to eliminate the baby’s nervousness and fear of the mind, is conducive to alleviate the phenomenon of fingernail biting. 2. Trace element deficiency: If it is due to the lack of zinc in the baby’s body, resulting in xenophagia, caused by biting fingernails. After a clear diagnosis, you can take lysine glucose zinc granules, zinc gluconate oral solution, etc., and at the same time in the diet eat more egg yolks, lean meat and other foods, is conducive to the body to supplement zinc, which will help to improve the phenomenon of biting fingernails. 3. Iron deficiency anemia: If the baby biting fingernails caused by iron deficiency anemia, mainly the application of iron to correct anemia, commonly used drugs are ferrous sulfate, iron dextrose, etc., and at the same time in the diet eat some pig liver, spinach and other foods containing iron to correct anemia, relieve the phenomenon of biting fingernails. Baby biting fingernails, should promptly consult the doctor to clarify the cause of the disease, and carry out targeted treatment. The above drugs should be used under the guidance of a doctor.