Under normal circumstances, a two-year-old baby should have 16-20 teeth. However, each baby’s teething situation is different, so if you find that your baby is slow in teething, don’t be too anxious, it is recommended to observe and pay attention to vitamin D. There are 20 baby teeth, which start to erupt 6-8 months after birth and come out by 30 months. When babies are 6-8 months old, the baby’s central incisor erupts, i.e. the two middle incisors in the lower jaw, followed by the two incisors in the upper jaw; 8-10 months old, the baby’s lateral incisors erupt, first the two outer incisors in the upper jaw, followed by the lateral incisors in the lower jaw; 12-16 months old, the baby’s upper and lower jaws begin to grow the first milk molar; 16-20 months old, the baby begins to grow milk molars in the upper and lower jaws. At 24-30 months of age, the second molar in the lower jaw first appears, followed by two second molars in the upper jaw, at which time all 20 baby teeth erupt. The above is the approximate age when the baby’s milk teeth erupt, and most children fit into this age range, but there are some individual differences, and not every child can follow this time exactly. After the baby’s first milk teeth come in, parents can help clean the teeth with clean gauze or cotton swabs every morning and evening. After the age of two, prepare a small-headed soft toothbrush for your baby and help him/her brush twice in the morning and evening. After all the milk teeth have erupted, it is best to give your baby an oral examination every six months.