When your little one develops a fever, it's natural to worry and wonder, "How long do fevers last in infants?" Fevers are often the body's way of fighting infections by creating a less hospitable environment for germs. While fevers can seem concerning, they are usually not harmful and often resolve on their own. Pre-Register Understanding How Long Fevers Last in Infants In most cases, fevers in infants last around two to three days ...