Infants eating fingers are common in the following cases: 1, psychological behavior abnormalities, babies without other organic lesions, because of the lack of care in the family, or single-parent families or abuse, etc., can make the child’s psychological insecurity, thus appearing finger eating phenomenon. Parents should not overly blame and overly concerned about this behavior, because too much attention and blame will only strengthen the symptoms, so give more love, appropriate diversion, after a period of time will generally improve. 2, trace element deficiency, when there is a zinc or iron trace element deficiency, will appear to eat nails and other omnivorous phenomenon, to take the child to the hospital for trace element testing, if necessary, to give iron dextrose or Zinc gluconate oral solution, etc.