Delayed eruption of milk teeth is often a sign of hypothyroidism or a deficiency of calcium or fluoride. For normal physiological state of the baby, generally in the first six months of life will begin to erupt milk teeth, and the delayed eruption of milk teeth refers to the baby in the first 13 months of life has not yet erupted milk teeth. The common clinical cause of delayed teething is hypothyroidism, and the lack of calcium or fluoride in the baby’s body due to improper feeding can also cause delayed teething. If your baby’s teeth have not erupted even after 13 months of life, it is recommended that you go to a pediatric clinic as soon as possible to determine the cause of the disease and follow the doctor’s instructions for standardized treatment to ensure that the disease has a good prognosis.