It is normal for seven-month-old babies to grow teeth underneath their mouths. In general, babies will normally erupt their milk teeth around 4~6 months, a few babies erupt their teeth later, such as around 10 months have not yet erupted milk teeth, we should go to the regular pediatric hospital as soon as possible to find out the reason, and take remedial measures in a timely manner. However, it is normal for 7-month-old babies to grow teeth under their mouths, just a little late eruption, parents do not have to worry too much. If the baby’s teeth are too late, it is recommended that parents pay attention to the baby’s calcium and vitamin D supplement to promote the eruption of baby teeth. Parents should pay attention to the oral health of the baby, you can use a clean gauze dipped in warm water to gently wipe the baby’s teeth and gums, good oral hygiene. After the baby drink milk, to feed the baby to drink some water, to avoid the oral cavity residual milk.