Late tooth replacement does not necessarily mean late development, tooth replacement is related to physiological factors and disease factors. Late tooth replacement does not necessarily mean late development of children, normal children’s tooth replacement begins at the age of six or seven years old, and lasts until the end of about 20 years of age. During the normal tooth replacement period, some children’s teeth are replaced early, some children’s teeth are replaced late, generally speaking, as long as the individual differences are relatively large. When a child’s diet is too fine during the tooth replacement period and he or she does not chew sufficiently, the teeth will fall out later than normal. Calcium deficiency or caries in the milk teeth can also lead to slow tooth replacement, and dental caries requires timely dental treatment. So there is no direct link between late tooth replacement and late development, if the baby has oral problems, it is recommended that timely stomatology consultation, in accordance with the doctor’s instructions to be targeted treatment.