Well, he's hardly a baby any more, he's 20 months, but he's been doing it ever since he was tiny. I had to give up BF at 8 months because I just could not find a way to train him out of biting me when he fed, despite managing fairly successfully with DS1 and DD, and feeding them both to 1yr.
Now, he bites us. Not that often - maybe once a fortnight or so, but he's just bitten DD on the thigh and left an awful mark. She was absolutely howling. I keep reassuring her and DS1 that he'll grow out of it, but WHEN?? It's really not fair on them when it happens, but he still seems to have absolutely no concept that it hurts someone - he just laughs when I tell him off. I don't do naughty step or anything like that - not that I think it would have the slightest effect at this age if I did - so what's left? When it happens, I raise my voice (not shout), tell him very firmly that it's a bad thing to do and it hurts, and immediately give attention to the bitee 
. But it makes no difference. Thank god he's not at nursery, he'd probably be doing it there too. Any ideas, people?