Why does my 1 year old hit?

The interesting thing is that children who are never hit, still hit. the same goes for biting and pulling hair, at 1 year of age babies really have very little knowledge of what they are doing, and some do it because of the reaction it gets, some might think its playing, we as parents need to show them that it is wrong, and to show them other ways of doing things. it doesnt mean the baby is naughty.