How does the child have a fever and cramp? Children have fever and cramps. The most common is febrile convulsion. Febrile convulsion is usually caused by respiratory tract or digestive tract infection. In the process of temperature rising at the beginning of fever, the baby suddenly developed cramps, which were manifested as generalized convulsions, lasting for several seconds, tens of seconds to several minutes, generally no more than 15 minutes. When the baby wakes up after convulsion, the general condition is normal and there are no positive signs of the nervous system. The prognosis of febrile convulsion is generally good, and there will be no sequelae of nervous system. Some fevers and cramps are found in intracranial infections, which are characterized by fever, headache, vomiting, and convulsions. Young children are characterized by crying, restlessness, or lethargy, which can have positive signs of the nervous system, and can be clearly diagnosed through lumbar puncture. Most intracranial infections are actively treated, with a good prognosis, and some will leave neurological sequelae.