R.V.
Ignore the nay-sayers. :) My son had 2 fully protruding teeth at 3 months old. It is very possible. You could feel around his gums and see if you feel anything starting to come through. Some orajel on the spot will help a bit... or just some chew toys... maybe some crushed ice in one of those net-feeders... even a cold wet rag he can chew on?