5 month old baby teething?

My sons would start teething about that time. However, it may take another six months or longer for them to pop out. Sometimes a little less. Although all started teething around that time the earliest one ever cut was at 11 months. They go through periods from time to time where they are shifting, moving and irritating them. Then they'll go through a period of a few days where they are fine and so forth. If they are being bothered to where they can't sleep through the night I will give them a dosage of tylenol/acetaminophen. None of my children cared at all for the baby oral-gel and teething tablets really didn't seem to do anything. During the day I give them chilled teething toys to help with the irritation if they seem to be having problems.