Best prophylaxis for a 3-year-child with febrile seizures: 
a. Benzodiazepines 
b. Paracetamol q6h 
c. Paracetamol and nitrazepam 
d. Phenobarbitone 

The best prophylaxis for a 3-year-old child with febrile seizures would be option d. Phenobarbitone.

Febrile seizures are convulsions that can occur in young children when they have a high fever, usually above 38 degrees Celsius. They are quite common and typically happen between the ages of 6 months and 5 years.

To prevent future febrile seizures in a child who has already experienced one, prophylaxis medication may be recommended. Phenobarbitone is a medication that suppresses the abnormal electrical activity in the brain that can lead to seizures. It is often prescribed as a prophylactic treatment for children with recurrent febrile seizures.

It is important to consult with a pediatrician or a healthcare professional before starting any medication. They will evaluate the child's medical history, frequency of seizures, and other factors to determine the most appropriate treatment. They may also consider other factors, such as the underlying cause of the fevers, to ensure the best course of action.

Febrile seizures are generally harmless and do not cause any long-term effects. Most children outgrow them by the age of 5 without any further issues. However, it is crucial to take necessary precautions to manage and prevent any potential harm during a seizure episode.

In addition to medication, other measures can also be taken to prevent febrile seizures, such as:

1. Maintaining a normal body temperature: Keep the child's body temperature within a safe range by using appropriate fever-reducing medications, like paracetamol (option b) or ibuprofen, as recommended by a doctor. 2. Dressing the child in light clothing: Avoid overheating the child by dressing them in lightweight clothing and ensuring the room temperature is not too hot. 3. Hydration: Ensure the child is well-hydrated to help regulate body temperature. 4. Identifying and treating the underlying cause of the fever: Febrile seizures are typically triggered by a fever, so addressing the underlying cause of the fever, such as an infection, can help prevent future seizures.

Remember, it is important to consult with a healthcare professional for proper diagnosis, treatment, and guidance for any medical condition.