First, the time and order of baby teeth 1, the time and order of eruption of milk teeth: some children will have individual teeth eruption order reversed, but ultimately does not affect the arrangement of teeth, no need to deal with. 2, the time and order of permanent teeth eruption. 2, the time and order of eruption of permanent teeth 2, the characteristics of the eruption of baby teeth 1, the teeth erupt in a certain order, the eruption of the successive and the embryonic development of the teeth is basically the same as the successive. 2, the eruption of teeth has a certain time, but its physiological range is wider, individual differences. Late eruption of 6-12 months is normal. 3. The left and right teeth of the same name erupt roughly at the same time. 4, the mandibular teeth erupt slightly earlier than the maxillary teeth of the same name. Third, the symptoms of baby teething During teething baby is going to have some abnormal performance, different babies behave differently, overall there are mainly the following nine aspects: 1, pain: your baby may show signs of pain and discomfort. 2, cranky: the discomfort caused by the teeth will make your baby cranky and crybaby, which is especially obvious one or two days before teething. 3. Red cheeks: You may notice red spots on your baby’s cheeks. 4, Drooling: The excess saliva produced during teething can cause your baby to drool a lot. 5, Gnawing, chewing or biting: Put anything near your baby’s mouth and he may exhibit the above actions. 6, swollen gums: Check his mouth to see if there is a little redness or swelling on the gums. 7. Restless sleep: Your baby may wake up in the middle of the night and seem restless, even though he has been sleeping soundly before. 8, increased body temperature: teething can make the body temperature rise slightly, so the baby may feel a little hotter than usual. 9, pain in the buttocks: Although we are not sure why, some parents have noticed that babies are more likely to suffer from diaper rash when teething, and may have loose stools. Fourth, the reasons why babies are too slow to grow teeth 1, congenital heredity: the main reason why young children are slow to grow teeth comes from heredity, including family history, race, and so on, and even the gender will also make a difference. According to most research reports, girls’ teething time will be earlier than boys. 2.Acquired environment: In addition to genetic factors, the acquired environment may also indirectly cause slow teething. Take a preterm baby as an example, his teething time must be deducted from the preterm birth time, so that the conclusion is more accurate. In the case of a preterm baby born at 30 weeks of gestational age, the time of the first tooth must be delayed by 10 weeks (usually 6 to 8 months after birth). In addition, any baby with a low birth weight is also likely to have slower teething problems. 3.Systemic diseases: Down’s syndrome, pituitary gland secretion abnormality, ectodermal dysplasia syndrome, etc., may cause differences in the speed of teething in young children, and blood tests must be taken to determine the real cause of the disease. 4, trauma and infection: if the child’s milk teeth appear to vary in height, it is likely that the teeth have been hit by external forces, resulting in necrosis of the ligaments connected to the teeth, and replaced by new bone (bone adhesion), from the appearance of a tooth appears to grow slower, but in fact, it will affect the eruption of permanent teeth. If a child loses his milk teeth early, connective tissue will be formed on the surface of the gums, and once the permanent teeth are not fully grown at this time, they will be compressed, resulting in slower eruption of the permanent teeth. In addition, sometimes the medication taken by the child will make the gums thicken and the teeth will not come out easily, which will also make the parents have the misunderstanding that the growth of teeth is slower. It should be reminded that toddlers have different teething cycles. Although the first tooth should come out at about 6 months of age, a gap of less than half a year is considered normal in the case of milk teeth, while a reasonable gap in the eruption time of permanent teeth can even extend up to one year. Therefore, generally do not need to worry too much, usually just the different speed of the time of teething, and will not affect the function of the teeth. Fifth, the baby teeth may appear abnormal symptoms 1, early eruption of milk teeth – birth teeth and newborn teeth: the child was born with teeth eruption, known as “birth teeth”. Within 1 month after birth, there will be milk teeth eruption, called “newborn teeth”. Birth teeth and newborn teeth are mostly found in the mandibular milk incisors. Most of these teeth do not have roots or have short roots, and some are extremely loose. Because birth teeth and newborn teeth have an impact on the baby’s breastfeeding and the risk of being inhaled by the baby’s windpipe after being dislodged, they are often extracted. 2, late eruption of milk teeth: 1 year after the birth of the baby, the eruption of the first milk teeth, are within the normal range. If more than 1 year old, or even after 1.5 years old, the first baby tooth is still not erupted, more than 3 years old baby teeth have not yet erupted for late eruption of baby teeth. 3, eruptive gingivitis: is a common temporary gingivitis when milk teeth erupt. The gingival tissues along the crowns of the teeth are engorged with blood, but there are no obvious conscious symptoms, and it will gradually heal itself with the eruption of the teeth. Eruption gingivitis is mostly due to the eruption of teeth, gums often have a strange feeling, so that the child with a finger, toys and other touch or bite and chew, resulting in gingival mucosal abrasions. 4, eruptive cysts: before the eruption of milk teeth, sometimes clinically visible covering the teeth of the mucous membrane localized swelling, greenish-purple, containing tissue fluid and blood, there is the name of eruptive cysts. Generally, it will not affect the eruption of the tooth. If the eruption is obstructed, it is necessary to remove part of the tissue to expose the crown. In the process of eruption of milk teeth, if some abnormalities do occur, parents are advised to find a professional dentist for clinical consultation. Sixth, the baby teething period of care 1, massage the baby’s dental bed: parents can use their fingers to gently massage the baby’s red and swollen tooth flesh, so that the baby can feel more comfortable. 2, prepare frozen, soft food: if the baby is not willing to eat, no appetite, you can prepare some frozen, soft food for the baby. 3, give the appropriate “apparatus”: in the teething period, the baby will like to bite hard things, in order to prevent the baby scratching and biting, parents can prepare for him to fix the teeth device; eating carrots, apples or slightly hard vegetables, parents must be careful not to let the baby bite too much and be choked. Usually also need to pay attention to not let the baby get coins, peanuts, small toys and other easy to swallow things, in order to avoid the baby will put them into the mouth, accidentally choked in the throat. 4, timely care and concern: in the beginning of the teething period, the baby more need of parental care and concern, so that can ease the baby’s emotions, so that the baby feels warm and comfortable. Seven, baby teething dietary taboos 1, tetracycline drugs. Tetracycline drugs can lead to yellow and black teeth, usually pregnant and breastfeeding women and babies under eight years of age using tetracycline drugs that may have tetracycline teeth, especially in the baby before the age of 5 years old to take a greater impact. 2, water containing too much fluoride. The development of permanent teeth mineralization is completed before the age of 6-7 years. Drinking water fluoride to keep within 0,5-1ppm is most suitable, this concentration can play a role in preventing caries, and will not occur chronic fluorosis. If during the period of dental development and mineralization, drinking water containing too much fluoride for a long time, it will cause yellow stained teeth (medically known as fluoride enamel or dental fluorosis), and even lead to chronic fluorosis. 3, sweets, carbonated drinks. Candy, with sticky sweets easily attached to the tooth surface and teeth, can be fermented to produce acid, constituting dental caries. Carbonated beverages are also easy to cause tooth decay, but also affect the appetite, so to avoid the baby before meals, especially before bedtime snacks or candy.