Teeth grinding in infants is related to neurodevelopment, nutritional absorption, digestive function, ear, nose and throat infections, parasitic infections and other reasons. 1. Neurodevelopment: As the nerve development is not yet sound, infants are prone to generalization of stimuli, which may lead to jittering, teeth grinding or restlessness during sleep. Infants need to supplement 400U vitamin D daily to promote the metabolism and absorption of calcium and phosphorus. Calcium supplements can be used when necessary to play a role in nourishing the nerves and reducing nerve excitability. 2. Nutritional absorption: infants grinding teeth may also be due to poor digestion, gastrointestinal tract burden caused by grinding teeth. Nausea and vomiting, diarrhea and bloating should be noted, can be given to promote digestion of drugs and probiotics treatment. 3. Inflammation of the ear, nose and throat: babies grinding teeth need to observe whether there is inflammation of the ear, nose and throat, timely medical treatment. 4. Parasitic infections: Parasites such as roundworm infections can irritate the intestines and surrounding organs, causing indigestion, abdominal pain and other symptoms, causing babies to sleep uneasily, thus triggering the symptoms of baby teething, and should be timely medical treatment, deworming treatment. To sum up, there are many reasons why babies grind their teeth, which should be judged according to factors such as the development of the baby and other accompanying symptoms, and the use of medication needs to be carried out under the guidance of a professional pediatrician, do not use it on your own to avoid adverse consequences.