The causes of baby’s lack of teeth growth include the following: firstly, it is caused by calcium deficiency. If the baby lacks calcium, it will cause a delay in the eruption of teeth. For example, at the age of one week, there is still no tooth, and this time we should give the baby calcium treatment in time. Secondly, it is caused by physical characteristics. If the baby in 8-9 months when there is still no teeth eruption, this time there is no other special discomfort, there is no occipital baldness, chicken chest, rib beads, sweating more and other symptoms, is due to the special characteristics of the body, most of them will slowly erupt after the age of 1 year, parents do not need to worry too much.