A seven-month-old baby who has not yet developed teeth is not considered to have delayed tooth eruption, but disease needs to be ruled out as well. Infant milk teeth begin to erupt in about 6 to 8 months, so seven months the baby has not grown teeth, does not belong to the delayed tooth eruption, consider it a normal situation. Baby teeth eruption period, you can adjust the diet structure in moderation, or pay attention to increase nutrients, such as protein, calcium, phosphorus, vitamins and so on. If the delayed eruption of milk teeth, need to consider genetic, endocrine, food properties and other factors, you can go to the hospital to rule out disease factors, under the guidance of the doctor to deal with the appropriate.