My 1 year old started biting really badly at about 9 months, also around the time that 5 teeth were coming up....but it was mostly me he was biting... it kinda stopped about a month ago but last week he bit mum BIG TIME.... i have also put it down to teething as the doc said another tooth was coming up the day he bit mum....

I have found that a strong firm NO and a tap on the hand seems to nip it in the butt a little... im not into smaking but a tap on the hand seems to do enough...