Generally 4~10 months to start teething is a normal phenomenon, but due to the growth and development of babies have differences, teething time is different, usually can not be later than 13 months.
Newborns at birth already appeared in the ossified milk teeth embryo, but the surface is covered by the gums, generally 4 ~ 6 months after birth teeth began to gradually erupt, milk teeth a total of 20, before the age of three years old can be out of all the milk teeth, but the time of eruption, the order of eruption, the time of eruption, etc. with genetics, feeding and other factors related to the existence of a certain degree of variability.
Delayed eruption of milk teeth later than 13 months is called delayed eruption, which is generally abnormal and may be related to vitamin D deficiency, calcium deficiency and other factors, and it is recommended to go to the hospital in time to find out the cause of the disease and then intervene in a timely manner.