It is possible that it is a normal phenomenon for babies to have no teeth at 7 months old, and it cannot be ruled out that it is caused by the lack of calcium in the body. Teething time may be related to dietary habits, genetic factors and other reasons, a part of the baby around 5 months can appear the phenomenon of tooth eruption, there are some babies in the 8 ~ 10 months, the teeth will gradually grow out. Therefore, 7 months do not grow teeth, may also belong to the normal phenomenon. However, it can not be ruled out that the body is caused by calcium deficiency, if the body lacks calcium, it is possible that the teeth will grow later, and there will be the phenomenon of occipital baldness, if necessary, you can take the baby to do micronutrient testing, to clarify the cause of the disease. In the baby about 7 months to add appropriate complementary foods to increase nutrition, if breastfeeding, the mother can eat more dairy products and meat and other protein and calcium content of food, usually parents should also take the baby more sunshine, can promote the body’s absorption of calcium.