The trembling tongue of newborns is considered to be caused by physiological phenomenon, lack of oxygen, lack of calcium and so on. 1. Physiological phenomenon: mainly due to the fact that newborns have just been born, the development of brain tissue is not yet fully mature, and the ability to control the muscles is relatively poor, there may be occasional trembling of the tongue, mouth trembling and other symptoms. 2. Lack of oxygen: During pregnancy or perinatal period, there may be lack of oxygen, such as asphyxia, intrauterine distress, umbilical cord around the neck, etc., which may also cause tongue trembling. 3. Calcium deficiency: Calcium deficiency in newborns is mostly caused by severe calcium deficiency during pregnancy, which affects the development of bones and muscles of newborns, thus causing tongue tremors. Newborn tongue tremor, there may also be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.