Teething is the first time a tooth breaks through a baby's gums. Teething usually starts around 4 to 7 months of age, with an average of 6 months. This can cause fever, drooling, irritability, poor feeding, diarrhea, or increased crying.

Teething fever in children often occurs during the teething period, some children may have a fever, however, not all children have a fever when teething.