There are some clearly laid out guidelines that tell you when it’s time to go see a doctor if your baby has a fever. For babies younger than three months, you should promptly visit the doctor if the fever is 100.4°F (38°C) or higher. Or, if your little one is between 3 - 6 months old, it’s time to pay a visit to the doctor’s clinic immediately if the thermometer displays a reading of 102.2°F (38.8°C) or higher.
Furthermore, babies older than 6 months may be treated at home if there’s no loss of appetite and the baby is playing well without being too fussy. But careful monitoring is crucial when you’re managing the fever at home, without seeing a doctor, because new symptoms such as drowsiness, loss of appetite, or trouble breathing may appear, or the fever may get worse, all of which require urgent medical attention.