My almost 6 month old has a fever of 102.3. can he run fevers with teething? he has no other symptoms and is not fussy at all.

See your Dr.: Unlikely that teething would cause a fever that high. Would follow up with your doctor at that young of an age.

Maybe he has roseola: Teething can cause fever but it typically mild. Many children can get cranky, but some are not. Fortunately my kids were not very cranky teething, but drooled quite a bit. Roseola (a common childhood viral infection) can often cause high fever for 3-5 days, then a pinkish rash appears. It is usually a disease of no consequence, but high fever can cause parental concern. Consult doc if he worsens.

Due for an illness: I don't accept fever >101 as teething & am not sure it causes much stress in most infants. By 4mo the protective antibodies passed to baby during pregnancy have warn off & a kid is due for some random viral illnesses. If he is drinking well & wetting a diaper every 4-6h & playful for periods during the day, you may be able to monitor the situation at home.If he starts to act sickly, have him seen.

Yes that is normal.: It is very common for teething infants and babies to suffer from a high temp. You may use infant tylenol (acetaminophen) to bring it down. Or hylands teething tablets.