15 months baby grows 4 teeth, relatively speaking belongs to the slow growth of teeth, this situation is likely to be caused by a lack of calcium, need to take calcium supplements in a timely manner. Babies usually start teething 4 to 10 months after birth, and about 6 to 8 teeth at 12 months. If the 15-month-old baby only grows 4 teeth is a relatively slow situation, this situation is mostly caused by a delay in the eruption of teeth due to calcium deficiency, this time we need to give the baby timely calcium supplementation therapy. Can oral calcium gluconate, calcium carbonate, calcium lactate and other drugs for treatment. Usually eat some egg yolks, liver, carrots, apples, dates and other foods to supplement vitamin C, improve immunity and promote metabolism. Usually also need to often go out in the sun, also helps to promote calcium absorption, the child must pay attention to the lack of calcium, because the overall growth and development will also have an impact. The child’s slow teething may also be caused by other reasons, it is recommended to consult a doctor in a timely manner to clarify the cause of the disease, and then give targeted treatment.