Baby Medicine for Fever and Pain Relief Infants? Advil 50 Mg Infant Ibuprofen is a liquid pain reliever and fever reducer that provides unsurpassed fever relief among OTC pain relievers/fever reducers for infants ages 6 to 23 months for up to 8 hours. With just one dose this baby fever medicine temporarily reduces fever and relieves minor aches and pains due to the common cold flu headaches toothaches and sore throat. The medicine in Infants Advil is the #1 pediatrician-recommended active ingredient in a fever reducer/pain reliever to reduce fever below 100 degrees F both faster and longer than Tylenol. The convenient dye-free liquid medicine suspension form included syringe and great tasting white grape flavor make this baby pain reliever easier to take with less mess. When your baby has a fever you know what it?s like to wait it out. Help them feel better with this infant pain relief medicine.