When baby gets a fever, both parents and pediatricians want to be sure a treatable source of infection is not missed. During this time, many parents ask if their baby could have strep throat. The short answer is that babies rarely need to be treated for strep throat.
In children over the age of 3, the bacteria that causes strep throat can cause significant complications if untreated. The bacteria can cause trouble in a child's kidneys, skin, and heart—the infection should not be missed! However, we don't see those complications in infants. Even if an infant may have evidence of the strep bacteria in his or her mouth, antibiotic treatment is not necessary.
The good news that sore throats in infants are most commonly caused by common community viruses. With some pain reliever, rest, and good nutrition, most babies get better in a few days. Talk to your pediatrician to discuss what he or she recommends.
Additional Information from HealthyChildren.org: