The baby seven months do not grow teeth is affected by many factors: First, affected by genetic factors, if the parents teeth grow later, the baby in the genetic factors affecting the growth of teeth will also be later. Second, nutritional status factors, if due to vitamin D or calcium deficiency, the baby will also have a late development of teeth. Third, developmental backwardness, the baby due to malnutrition or some disease factors lead to growth and development backwardness, there will also be a situation of non-teething. Fourth, the gums, if the gums have some special lesions will also have the situation of not growing teeth, the specific causes are best to take the baby to the hospital for a detailed examination, according to the actual situation of early intervention, if it is purely due to the influence of genetic factors, there is no need to intervene and treatment.