There is no specific clinical manifestation of teething in children. Individual babies may drool, bite the nipple during breastfeeding, cry or even have low-grade fever. The majority of children’s teething occurs at 4-6 months of age, however, there are large individual differences in the eruption of milk teeth and the order of teething, and there is also a certain relationship with heredity. With the progress of society, human beings eat more and more fine food, the time of the first eruption of teeth has also been pushed back, before the age of 1 year, the teeth are normal phenomenon. Healthy teeth require a healthy body and appropriate food, and the chewing of food is conducive to the development and eruption of teeth, so it is important to add complementary foods to stimulate the eruption of milk teeth after 4-6 months of age.