M.M.
Yes STARTTING to.
My baby was 4 mos old.
The pediatrician said "No! Too early!" Hmm.
Well he was and his teeth came in earlier than most. Two weeks later i could see a tooth barely start to erupt.
Another two weeks and bam!
So I learned early on mom's sometimes know best and rubbed Baby Orajel on his gums.
Gave him Infant Tylenol when needeed.
Then Infant Motrin when his molars came in.