A fever of 41.3 degrees in an eight and a half month old child may trigger convulsions and cause irreversible damage to the brain. Eight and a half months of the child burned to 41.3 degrees belongs to the ultra-high fever, at this time, the child’s nervous system is not well developed, prone to febrile convulsions, resulting in the child’s sudden loss of consciousness, eyes rolled up and squinting, purple lips, limbs, such as tonic clonus phenomenon, and some of the children can also be foaming at the mouth, urinary and faecal incontinence, and even respiratory apnea. In addition, fever convulsions if not treated in time, may cause cerebral anoxic damage, irreversible damage to the brain, and even life-threatening. Eight and a half months of the child fever to 41.3 degrees, it is recommended that the parents of the child immediately take the child to the hospital, identify the cause of the disease, as soon as possible to receive treatment, do not self-medication.