Frightening tremor is also known as shock-like trembling. Newborns’ tremor may be caused by lack of oxygen to the brain, but it is not absolute, and it may also be caused by imperfect development of the cerebral cortex, hypocalcemia and other reasons. 1. Cerebral hypoxia: newborns in the perinatal period due to asphyxia causes cerebral hypoxia, mild cerebral hypoxia may appear overexcited phenomenon, the body has trembling or tremor, increased muscle tone performance. 2. Imperfect development of the cerebral cortex: after birth, due to the imperfect development of the cerebral cortex, the sympathetic nervous system is immature, the limbs may tremble after encountering stimuli, manifesting as tremor, with the baby’s age, the brain excitability decreases, the symptoms will be relieved. 3. Hypocalcemia: newborns born with hypocalcemia, due to increased neuromuscular excitability, there will also be tremors. The causes of newborn tremor are more, specific to go to the hospital through the examination can only be judged.