How high can an infant's temperature go when teething?

Not very: I am not convinced infants actually develop fever when teething.They have so many minor viral illnesses between 6m-3y in the same time frame that there is sure to be overlap.If they do I would only accept up to 101. Any higher & i would want to look to some illness as a source.

Less than 101 rectal: A child may have a low-grade temperature when he or she is teething, but the temperature should be less than 101 rectally, anything higher than that i would not attribute to teething.

Not much: Teething should not bring a temperature higher then 101-102, .

100.7: If you infant's temperature goes above 100.7f then it is probably not teething. Consider contacting your pediatrician if the fever persists.