A low-grade fever in a 3-year-old toddler during teething is normal and usually recovers on its own. If the temperature is high or persistent, other causes of fever should be considered and prompt medical attention is needed. 1. Toddlers usually start teething around 6 months of age, and a slightly elevated temperature may occur during teething. If not accompanied by other symptoms, it may be a symptom of the teething process, and may be accompanied by drooling, biting, and irritability. 2. If the temperature is high or the fever persists, it should be considered whether it is caused by bacterial or viral infections such as upper respiratory tract infections or oral diseases such as gingivitis or dental caries that cause fever. Young children should pay attention to oral hygiene, brush their teeth diligently, and rinse their mouths before and after meals. If the fever persists or the temperature is high, they should consult a doctor in time for treatment under the guidance of a doctor.