Generally babies teething time in about 6 months, 6 months until about 2 and a half years of age, usually twenty milk teeth, but between 4-10 months teething are within the normal range. Some babies teething early, 4 months when the baby teeth began to erupt, this also belongs to the normal range; some babies a little later, until 10 months to begin to come out, parents should not be too worried, anxious. Individual children also have one year old teething, which is an individual phenomenon. If teething is too late, also pay attention to whether there is a calcium deficiency, for example, the baby after 10 months still does not teething, can be tested for trace elements or vitamin D deficiency, if necessary, appropriate supplementation of calcium, or vitamin D, to help the baby smooth teething.