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What is 4-year-old male child had febrile seizures, best prophylaxis – and explain in detail?
Prophylaxis in febrile seizures 
Prophylactic anticonvulsants are not given routinely in febrile seizures. They are required when -

A febrile seizure is prolonged or complicated
Medical reassurance fails to relieve family anxiety.
	Prophylaxis may be continuous or intermittent

Intermittent prophylaxis

It is currently the desirable form of therapy
It is used during episodes of fever
Indicated during first three days of fever:
Drugs that are used are - Diazepam and other benzodiazepines (these drugs are used because they attain desired levels quickly) Diazepam is given oral or rectal.

Continuous prophylaxis -

It is used when
Intermittent therapy has failed                             
Central nervous system disease                             
Drugs used are → Sodium valproate or phenobarbitone.
Recurrent atypical seizures
The family history of epilepsy

Note - Carbamazepine and phenytoin are ineffective for prevention of recurrence.