The symptoms are suggestive of Febrile Seizures( fits
or convulsions) which occur in some children under five year old,during fever
. You should keep the temperature down by anti-pyretic medicines like Tylenol
and if it is very high, may even do cold
sponging with tap water. Do consult a Pediatrician
who will prescribe some anti convulsion medicine,you can give , next time the child has fever. However the doctor will definitely examine the child and order the necessary investigations to rule out other serious causes of seizures especially if your child gets them even without fever.
Best of luck 2 u and the kid.