Most of the seven-month-old baby has not teething yet is not yet to teething, it may also be caused by disease factors, such as malnutrition, congenital lack of teeth, growth retardation and other diseases. 1, physiological phenomenon: most babies start teething 6-8 months after birth, but the time of teething is different for everyone. Some babies may grow teeth earlier, some later, and some even grow their first teeth at about 1 year old, so it is normal for a 7-month-old baby to have no teeth for the most part. If you are healthy, you do not need to worry too much, you can observe temporarily; 2, disease phenomenon: common malnutrition in daily life leads to late eruption of teeth, baby lack of vitamin D or calcium, you can give the baby appropriate amount of calcium, vitamin D, take the baby out more activities, sunshine, in order to promote the growth of teeth. 1 year old after still no teeth baby can go to the Department of Dentistry to check whether there is a dental embryo, if there is no dental embryo. If there is no germ, the baby is congenitally missing teeth. If there is a germ, it means that the teeth are erupting too late due to other reasons, so a detailed examination is needed to clarify the cause and provide targeted treatment. Parents who find that their seven-month-old baby is not teething and has delayed development should go to the pediatrician to find out the cause.