I have a three year old and a one year old who constantly bite each other. It's horrible and I really don't know what to do. My 3 year old is the worst and is encouraging my 1 year old to do it. If one of them take a toy then the other bites. It happens every day. My 3 year old will bite me or my DH if he is throwing a tantrum. I've tried reasoning, ignoring, yelling (out of fright) giving him "some space" in his room. After it happens I calmly explain his much he hurts us and really upsets me but it doesn't work. He doesn't listen. I don't know what else to do.