It is normal for a baby to be six months old and not yet teething. The teething period is usually between 4-10 months, and as long as it is between this age, baby teething is usually within the normal range. Teething can be influenced by many factors, such as genetic factors, nutritional factors, and disease factors. Therefore, there are significant individual differences in the age of teething. Some babies may start teething earlier, at four months of age. Some babies are later in teething and may take ten months to erupt their first tooth. Even if the baby’s teeth erupt at ten months, there is no need for parents to be overly nervous about this situation, as long as the baby’s growth and development is normal, then it is considered normal in this case. If the baby is more than a week old and still has not erupted the first tooth, then it should be considered that the baby may have delayed teething. 1, genetic factors: if the parents or immediate family members within three generations have late teething, then the baby is also prone to late teething; 2, environmental factors: if the baby is born prematurely or is born with low weight, this may lead to delayed teething; 3, disease factors: such as ectodermal dysplasia, Down’s syndrome, or abnormal secretion of the hypothalamus pituitary gland, these can also interfere with the normal teething speed of the baby, resulting in delayed teething; 4, other reasons: if the baby’s teeth have been impacted by external forces, it can also affect the normal teething time. If the baby is more than one week old and still has not erupted teeth, you need to take the baby to the hospital for a detailed examination. The cause of the problem can be clearly identified so that targeted treatment can be given in time. In daily life, you can take your baby to get more sunlight to increase the amount of active vitamin D in the body, which will help accelerate the eruption of baby teeth.