The baby loves to bite, the following situations are common: 1, trace elements reasons, when there is a lack of trace elements such as zinc, iron, or lead poisoning, there will be biting and other abnormal behavior, so take the baby to the hospital for trace element testing, according to the test results to give the appropriate supplement. 2, abnormal psychological behavior, most babies because of the lack of parental care, single-parent families, or the existence of family abuse, etc., so there is a sense of security Lack of, appear biting and other abnormal behavior, so parents should give more love, care, observation. 3, belongs to the normal situation, the baby occasionally appear biting phenomenon, but parents excessive attention, so that the baby thought that this behavior can cause excessive parental attention, thus reinforcing the biting behavior, so parents can bite when the baby appears, divert its attention and observe for a period of time.