Hi, Welcome to Health care magic forum.
As you describe, it appears that the baby had the
allergic reaction to some thing may of food,clothes,soap, or cosmetics.
You can trace out that allergen by noting down the things used previous day of the
fever,and avoid them to get rid of the fever.the fever could be due to the eosinophelia, a sort of
allergy. Can be controlled by using the di ethyl carbamazine citrate when ever there is fever. If it is the cause can have relief for longer duration.
The seizures could be the infantile
febrile seizures ,the baby will not get the seizures beyond the age of 4 years. He can get the relief of allergic fevers also beyond that age.
So far, take care when ever he gets the fever.
Wishing for a quick and complete recovery. Thank you.