I have a biter too in my daycare...he is 2 1/2 now and was good for a long time, but now it has flared up again. I sometimes think he does it for attention or out of jealousy because he only ever bites my kids! The only thing I have found that helps is to watch him like a hawk and catch him before he bites...the more times you can intervene and stop it before it happens, the better. I also give time-outs, but they don't seem to have much effect and I would say especially with a 14 month old, it is very hard for them to stop themselves and think "I might get a time-out if I do this". With my biter, also teaching what to do when he is frustrated has helped...teaching him to use his words...that might be harder with a 14 month old.