From the Guidelines

Paracetamol is the first-line treatment for pyrexia (fever) in a 4-month-old infant.

The use of an antipyretic drug is effective and paracetamol is preferred 1.
Physical methods such as fanning, cold bathing, and tepid sponging are likely to cause discomfort and are not recommended 1.
An adequate fluid intake should be ensured.
In the context of a pandemic, children in the community should only be considered for treatment with antivirals if they have an acute influenza-like illness, fever (>38.5ºC), and been symptomatic for two days or less, but this does not apply to the general treatment of fever in infants 1.
For infants under one year of age, oseltamivir may be considered for the treatment of severe influenza, but this is not the first-line treatment for fever in this age group 1.
Aspirin should not be used in children 1.

Fever treatment can help children feel better but will not prevent subsequent seizures 1.
The treatment of fever in children should focus on promoting comfort and preventing dehydration, rather than preventing febrile seizures 1.

From the Research

The first-line treatment for pyrexia (fever) in a 4-month-old infant is acetaminophen (paracetamol) 2, 3.

Acetaminophen is considered a safe and effective option for the treatment of fever in children 3.
The recommended dose of acetaminophen for infants is 15 mg/kg, which has been shown to be effective in reducing fever and is well-tolerated 3.
Ibuprofen may be considered as a second-line treatment for fever in infants, but it is not recommended for infants under 6 months of age due to the risk of adverse effects 2.

The primary goal of treating a febrile child should be to improve the child's overall comfort rather than focusing on the normalization of body temperature 4.
There is no substantial difference in the safety and effectiveness of acetaminophen and ibuprofen in the care of a generally healthy child with fever 4.
Combining acetaminophen and ibuprofen may be more effective than using a single agent alone, but it may also increase the risk of adverse effects and complicate treatment 4, 2.

Fever is a physiologic mechanism that has beneficial effects in fighting infection, and there is no evidence that fever itself worsens the course of an illness or causes long-term neurologic complications 4, 5.
The management of fever in children should focus on relieving symptoms and improving the child's comfort, rather than solely on reducing the fever 5.