This is because the order of tooth eruption may be affected by factors such as the growth of teeth and periodontal tissue, but usually there will be no adverse consequences, and parents should not be too worried. According to data analysis of the American Academy of Pediatrics, babies usually germinate their first deciduous teeth within 6-12 months, but due to individual differences, babies’ first teeth before 12 months are normal teething cycles. If the baby has not started to produce the first deciduous teeth after 18 months of age, it is normal to call the late deciduous teeth. Under normal circumstances, the baby will germinate the first baby teeth in about six months. At about two and a half years old, the deciduous teeth are almost all out. But this is only a general rule, because each baby is different, there will be individual differences in teething time. In addition to the timing of teething, the order of teething is also regular. Most babies will grow their deciduous teeth one by one in the order shown below, but there are some babies who do not follow the common sense to order teeth. The general routine teething sequence is shown in the figure below. The baby’s teeth are related to heredity, individual differences and whether the gums are stimulated enough. Many parents mistakenly believe that the baby’s late teething is related to calcium deficiency or other trace elements. In fact, there is no scientific basis. The teething sequence of the baby has nothing to do with calcium deficiency. Parents should never add calcium or other nutrients to their babies at will. And extra calcium supplementation may cause constipation of the baby, which is more than gain. Vitamin D can be added daily. Children who eat milk powder also need to pay attention to the calculation of the VD already contained in the milk powder, and the difference can be added.