If a newborn suddenly convulses, the following causes need to be considered: first, convulsions caused by a newborn suffering from hypoglycemia, which can cause feverless convulsions if the newborn’s blood sugar level is significantly low. In this case, the blood sugar should be tested in time, and if hypoglycemia is diagnosed, glucose should be replenished in time. Secondly, if the calcium level in the newborn’s body is significantly low due to other calcium deficiency symptoms, convulsions will also occur, and in this case, calcium supplementation can be administered. Once again, if the newborn has epilepsy, it can also cause feverless convulsions, and they are more obvious when the newborn just falls asleep. Finally, if a newborn has a central nervous system infection, it can also cause convulsions, which are often accompanied by high fever and vomiting, and can be diagnosed by cranial MRI or lumbar puncture.