If a full-term child develops chin tremors, the following causes are mainly considered: first, it is caused by the imperfect development of the child’s brain. Since full-term children are relatively young, the brain is not mature, and the brain’s control of the muscles around the body is not very good, which can cause uncoordinated movement, and the child will also appear to have a shaky jaw. The rest of the child’s condition is relatively good, such as the child’s mental state and breastfeeding are normal, as the child grows older, the shaking of the jaw will naturally disappear. Secondly, it is caused by the child having neonatal epilepsy. If the child has neonatal epilepsy, it will cause abnormal brain discharges, and the child will also have symptoms of shaking jaw, and the child will often appear to be frozen, as well as staring straight into the eyes and other accompanying symptoms, in order to give the child timely anti-epileptic treatment.