The throat is clean, the lungs are also clear. Today suddenly a temper…

The throat is clean, the lungs are also clear. Today suddenly a temperature of 38 degrees rose in the afternoon, the baby is burning and I gave him ibuprofen for children. But the child is active, behaves calmly. Can this be teething? The fingers do not pull out of the mouth. There is no diarrhea, he poops as usual 2-3 times a day.