Hi welcome to Health care magic forum. Your son aged 1 year 10 months had seizures only during fever. usually such seizures are called fibrile convulsions, and only occur during high fever
.Abnormal EEG during seizures or fever will be abnormal , so we can't rely only on EEG. MRI
may be necessory to know if some other disease is present or not. if no other disease is there the present problem is only a temporary and lasts for 4 years of age of the child, that too only during high fever.
So i advise you to keep watch of the child about high fever, and see the doctor if he gets fever till 4 years of age. after that such things wont happen.
Rarely they could be due to underlyin disease, but you can exclude them by MRI. if some other disease is there your doctor will take care of it , give treatment to it. so if you use medicines to controle the seizures also, the actual drugs will cure the disease so you need not worry. Wishing for a quick recovery and thanks for calling.