Slow teething in babies may be caused by vitamin D deficiency or calcium deficiency. Calcium deficiency affects teething, and slow teething can be caused by calcium deficiency. Normal children should start to grow teeth at about 6 months of age, if the child has not grown teeth after 13 months of age, it means that the teeth are slow, may be caused by a lack of vitamin D or a lack of calcium. Vitamin D can help the absorption of calcium, the child lack of vitamin D can cause calcium deficiency, usually give the child appropriate sunshine can help supplement vitamin D, if necessary, can supplement calcium. Slow teething babies need to actively consult the doctor, by the doctor to clarify the cause of the cause of treatment for the cause, do not self-medication. Do not use your own medication. The above medication should be taken in accordance with your doctor’s instructions.