It is normal for a baby to have teeth at 5-6 months of age. Usually the front milk teeth erupt first, followed by the cuspids and molars, and the milk teeth grow in a symmetrical order, with the bottom first and the top second. The time of tooth eruption varies greatly among individuals and is influenced by genetic and environmental factors. Under normal circumstances, girls have their teeth erupt earlier than boys, babies with good nutrition and high height and weight have their teeth erupt earlier than those with poor nutrition and low height and weight, and babies in warm regions have their teeth erupt earlier than those in cold regions. If the baby is stunted, has partial eating habits, long-term lack of nutrition, the eruption of milk teeth will also be delayed, parents do not need to worry too much.