Infants’ teething time is related to genetic factors and their own nutritional status, and most of them start teething at 4-7 months after birth, while some of them may start teething at 10-12 months. Teething in infants is mainly affected by genetic factors and their own nutritional status. Individuals grow and develop at different speeds and have different teething rates. If teething is late, it is possible that the baby lacks trace elements. You can go to the hospital for a trace element test, which is usually due to the lack of calcium in the body, and it is recommended that you take calcium supplements in time, or add more calcium-rich complementary foods. Normally, more outdoor activities and more sunshine can promote the absorption of calcium. Swelling, itching or pain in the gums may occur when babies are teething, which may cause abnormal crying, increased drooling, loss of appetite, fever, and frequent waking up at night, etc. This is generally normal and does not require special treatment. During teething, babies need to keep their mouths clean and hygienic. If gum discomfort occurs, you can massage the gums with moistened gauze or cotton swabs, or use teething rods and cookies to relieve the discomfort, or go to a pediatric dentist if necessary.